6 Ways to Fix 503 Service Unavailable Error (For Webmasters)

Does your website frequently give 503 service unavailable error? When your server RAM or CPU exhausted, your website will get down and gives this error. There are some reasons to this issue. This tutorial will give you possible reasons and solution for the error 503 service unavailable.

This tutorial is for webmasters. If you are a visitor of the website, you just need to wait for some time. Try the page after some time. This error occurs due to the server issue. If you are the website owner, follow below fixes.

It may take some time to try below methods and to fix the error. If you want to save your precious time, you can hire an experienced WordPress developer from any one of the top freelance websites like Freelancer or Fiverr.

How to Fix 503 Service Unavailable Error

Video Tutorial:

For the reader’s convenience, we always create a video tutorial. Either you can watch and learn or simply skip the video and continue with the steps mentioned afterward.

1.Increase more resources

If you see this error, check your traffic in Google Analytics. If you are getting more traffic than usual, you must extend your server resources. Contact your hosting support and ask them to increase your resources.

If you don’t get extra traffic and getting 503 service unavailable error, then there are below possible reasons for your issue.

2.Due to Faulty Plugin

Any one or some of your plugins might execute admin-ajax.php file frequently. You need to find the problematic plugin.

To find corrupted plugin, you need to disable all plugins. To disable all plugin.

Go to cPanel -> File Manager -> Public_html -> wp-content

Edit your plugins folder to plugins2.

Immediately all plugins will be deactivated. Now rename the Plugins2 folder to Plugins. You will see all plugins but all of them are deactivated in the dashboard.

Now check your website. If your website working fine now, there must be the issue with a plugin.

Enable plugins one after another and check your live site.  When you find a faulty plugin, deactivate that plugin and Find an alternative to that plugin.

Resource intensive plugins:

Some plugins need huge server resources I am giving some of them. Disable plugins and find alternatives to that plugin, your problem may temporarily be solved.

• Convertplug is a popup plugin which uses ajax file heavily. You can use Optinmonster plugin instead.
• Easy Social Share buttons plugin is a comprehensive social media plugin. If you use social counter, it will give issues.
• WordFence is the top security plugin. But it will consume your server resources heavily.
• All related post plugins need huge resources. Better stick to Jetpack related posts. Even it consumes resources.
• All popular posts.

3.Limit Google crawl rate

When Google crawls your site frequently, it will consume your server resources. It will also slow down your site. You can reduce the Google Crawl rate using Google webmaster tools. When you change the crawl rate, those settings will remain for 3 months.

Login into your Google webmaster tools. Navigate to Google crawl rate settings page from here.

Select your property. If you have two version (WWW and non-WWW), you need to do this for two version.

Select Gear symbol at the top right corner.

Select Site Settings.

Select Limite Google’s Maximum Crawl rate near Crawl rate.

Drag the slider towards the left side to reduce the crawl rate.

These changes will remain effect for 3 months.

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4.Replace WordPress cron job with the real cron job

WordPress Cron job executes every time when your websites page is loaded. It then checks for whether there is any scheduled task and it executes if available. It takes your server resources every time. You can disable WordPress cron job and you can manually add Cron job to execute once in 5 minutes to once in a 30 minutes. That depends on your server. You can ask your hosting provider for the maximum time for Cron job execution.

If your server does not support manual Cron job or if it does not give proper steps to set up manual Cron job, you can use External Cron job service EasyCron which solves you issue for free.

My website is on Siteground server. I use 30 minutes for my cron job.

First you need to disable your WordPress cron job. Just copy below code and paste in the wp-config file of your root directory. You can place it at the end of the document and before ending tag />

define('DISABLE_WP_CRON',true);

Now you need to create manual cron job which executes once in a 5 minutes to 30 minutes

Go to your cPanel. Search for Cron jobs. Select Cron jobs option.

You need to add the below command. Starting part of below command may differ from server to server. You can ask your hosting support for exact command. You must replace user word with your cPanel username.
/usr/local/bin/php /home/user/public_html/wp-cron.php

Just select your required time in the Common Settings and paste the command as shown below. Select Add New Cron Job.

5.Limit WordPress heartbeat

WordPress heartbeat functionality will communicate from your browser to your server when you logged in to your dashboard. It is very helpful function to auto save your edits and to show notification in real time. It uses admin-ajax.php file from wp-admin folder to do this function.

For example, if you are editing any post, WordPress heartbeat executes admin-ajax.php file every 15 seconds to autosave your post. It will consume your resources while you logged in. You can limit or completely you can disable this functionality.

If you are the only person working on your website, you can completely disable this functionality by pasting below code at the starting of your themes functions.php file. Make sure you have pasted below code right after <?php tag.


add_action( 'init', 'stop_heartbeat', 1 );
function stop_heartbeat() {
wp_deregister_script('heartbeat');
}

Instead of disabling it completely, you can limit this functionality by using heartbeat control WordPress plugin.

6.Block unnecessary bad bots

Many unwanted bad bots access your websites. It will increase your server resource usage. You can block them. Just paste below list of bad bots in your .htaccess file in your home directory.
# Block Non-Essential Bots #
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^(.*)2icommerce [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)archive.org [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Abont [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)abot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Accoona [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ActiveTouristBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)adressendeutschland [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)aipbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Alligator [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)AllSubmitter [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)almaden [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)anarchie [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Acunetix [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)AESOP_com_SpiderMan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Alexibot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Anonymous [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Anonymouse.org [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Apexoo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Aqua_Products [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)asterias [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ASSORT [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ATHENS [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)AtHome [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Atomz [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)attach [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)autoemailspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)autohttp [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BackDoorBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BackWeb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)binlar [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bandit [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Badass [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BecomeBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)berts [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bitacle [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Biz360 [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)bladder\ fusion [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Blog\ Checker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BlogPeople [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Blogshares\ Spiders [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bloodhound [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BatchFTP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bigfoot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Black.Hole [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BlackWidow [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BlowFish [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bolt [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Board\ Bot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bookmark\ search\ tool [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)b2w [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)bew [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BotALot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BotRightHere [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bot\ mailto:craftbot@yahoo.com [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Buddy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bropwers [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Browsezilla [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BuiltBotTough [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Bullseye [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)BunnySlippers [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)casper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Cegbfeieh [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)CheeseBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)cmsworld [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)checkpriv [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)choppy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)clshttp [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)CherryPicker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ChinaClaw [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)charlotte [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Convera [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Copernic [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)CFNetwork [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Collector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Copier [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)CopyRightCheck [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)cosmos [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Crescent [NC,OR]
#RewriteCond %{HTTP_USER_AGENT} ^(.*)curl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Custo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Cyberz [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)c-spider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Default\ Browser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^Da$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DataCha0s [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Daum [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Deweb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Digger [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DISCo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Digimarc [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)digout4uagent [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)diavol [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)discobot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DnloadMage [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DIIbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)dotbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DittoSpyder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Download [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Downloader [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Download\ Demon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Download\ Devil [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Download\ Wonder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)dragonfly [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)dirbuster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DreamPassport [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DSurf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DTS\ Agent [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)dumbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)DynaWeb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Drip [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)eCatch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ecollector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)edgeio [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)efp@gmx.net [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ecxi [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)e-collector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EasyDL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EBrowse [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ebingbong [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EirGrabber [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EmailCollector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Email\ Extractor [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EmailSiphon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EmeraldShield [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Enterprise_Search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EmailWolf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EroCrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ESurf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Eval [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Everest-Vulcan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)extract [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Extractor [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ExtractorPro [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Express\ WebPictures [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)EyeNetIE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FairAd [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)fastlwspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FileHound [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)findlinks [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)fimap [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FlashGet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Flaming\ AttackBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FHscan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)feedfinder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)fetch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FEZhead [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)flicky [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FlickBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Foobot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Forex [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)flunky [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Franklin\ Locator [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FreshDownload [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FrontPage [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)FSurf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Gaisbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Gamespy_Arcade [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)genieBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GetBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Getleft [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GetRight [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GetSmart [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GetWeb! [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Go!Zilla [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Google\ Wireless\ Transcoder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)g00g1e [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Go-Ahead-Got-It [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GOFORITBOT [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)gotit [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Grabber [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GrabNet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Grafula [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)grub [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)GT::WWW [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)heritrix [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Harvest [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Hatena\ Antenna [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)hloader [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HMView [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)holmes [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HooWWWer [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HouxouCrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HTTPGet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HTTP::Lite [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)httplib [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HTTPRetriever [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)HTTrack [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)humanlinks [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IBM_Planetwide [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)iCCrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Image\ Stripper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Image\ Sucker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)imagefetch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)imds_monitor [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IncyWincy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ichiro [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)iGetter [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ia_archiver [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IDBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)id-search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)id-search.org [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IlseBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Image\ Stripper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Image\ Sucker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Indy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InetURL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InfoNaviRobot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InstallShield\ DigitalWizard [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Industry\ Program [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InfoTekies [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Intelliseek [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InterGET [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Internet\ Ninja [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Iria [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IRLbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Iron33 [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ISSpider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)IUPUI\ Research\ Bot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ISC\ Systems\ iRc [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Java [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JBH\ Agent [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Jakarta [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JennyBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JetCar [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)jeteye [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)jeteyebot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JoBo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JOC\ Web\ Spider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JOC [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JOC\ Web\ Spider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)JustView [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Jyxobot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)jbrofuzz [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Kenjin.Spider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Kapere [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Kenjin [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)KRetrieve [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Keyword\ Density [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)KRetrieve [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ksoap [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)KWebGet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LapozzBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)larbin [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)leech [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LeechFTP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LeechGet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libwww [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libwww-perl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libwhisker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Link [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libghttp [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LinksManager.com_bot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LexiBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)lftp [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)loader [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libWeb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)likse [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)libwww-FM [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LinkextractorPro [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LinkScan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)linktiger [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LNSpiderguy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LocalcomBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)looksmart [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LinkWalker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)lmcrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Linkie [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)lwp-trivial [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)LWP::Simple [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mac\ Finder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mail\ Sweeper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)mark.blonin [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MaSagool [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Magnet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mag-Net [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MarkWatch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mass [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mata\ Hari [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MCspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MetaProducts\ Download\ Express [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Microsoft\ Data\ Access [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Microsoft\ URL\ Control [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Maxthon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MFC_Tear_Sample [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Memo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Microsoft.URL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Microsoft\ URL\ Control [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MIDown [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MIIxpc [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mirror [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Missauga [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Missouri\ College\ Browse [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)miner [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Missigua\ Locator [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Mister [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Monster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)mothra [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)mkdb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)moget [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Moreoverbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)netscan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MovableType [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MSIECrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MSProxy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MVAClient [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MyFamilyBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MyGetRight [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)kmccrew [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)MSFrontPage [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)nameprotect [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NASA\ Search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Naver [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Navroad [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NearSite [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetAnts [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)netattache [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetCarta [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)nessus [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Netcraft [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetMechanic [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetResearchServer [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetSpider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NetZIP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Net\ Vampire [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NEWT\ ActiveX [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Nextopia [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NextGenSearchBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Net\ Vampire [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^NG$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NICErsPRO [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NimbleCrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)noxtrumbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Ninja [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)NPbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Nutch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)nikto [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Octopus [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Openvas [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Openbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Offline [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Openfind [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)OpenTextSiteCrawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Oracle\ Ultra\ Search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)OutfoxBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)P3P [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PackRat [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PageGrabber [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PagmIEDownload [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)panscient [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Papa\ Foto [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)python [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)pavuk [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PECL::HTTP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PeoplePal [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)pcBrowser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PHPCrawl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)perl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PerMan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PersonaPilot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PleaseCrawl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PHP\ version [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PlantyNet_WebRobot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)playstarmusic [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Plucker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Pockey [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Port\ Huron [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ProPowerBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)prospector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ProWebWalker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Prozilla [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PushSite [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PussyCat [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)PuxaRapido [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)puf [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Program\ Shareware [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Progressive\ Download [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)psbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)psycheclone [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)planetwork [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)postrank [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)purebot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)pycurl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Python-urllib [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Pump [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)QueryN [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Radiation [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RealDownload [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RedCarpet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RedKernel [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Reaper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Recorder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ReGet [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)relevantnoise [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Rippers [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SBIder [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)scooter [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ScoutAbout [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)script [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)searchpreview [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)searchterms [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Seekbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Serious [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Shai [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)shelob [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Shim-Crawler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SickleBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RepoMonkey [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RMA [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Rover [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Rsync [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Rufus [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)RTG30 [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SAPO [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Siphon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)InternetSeer.com [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)sitecheck [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SiteSnagger [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Slurpy\ Verifier [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SlySearch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SmartDownload [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)sna [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Snake [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)snagger [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Snapbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Snoopy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Steeler [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SpaceBison [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SpankBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)spanner [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SpeedDownload [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Spegla [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Sphere [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Sphider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Webscanner [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Sqworm [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Stamina [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SpiderBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)sproose [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)sootle [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)seekerspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Stripper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)studybot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Sucker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)siclab [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)skygrid [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SuperBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SuperHTTP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Surfbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)SurfWalker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)suzuran [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Szukacz [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)sqlmap [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)tAkeOut [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)TALWinHttpClient [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)tarspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Teleport [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Toata\ dragostea [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)toCrawl [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)urllib [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)User-Agent [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Telesoft [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Templeton [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)TestBED [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)turnit [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)TurnitinBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)The\ Intraformant [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)TheNomad [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)TightTwatBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Titan [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)True_Robot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)turingos [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Twisted\ PageGetter [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URLy.Warning [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URL\ Control [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URLy\ Warning [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URL_Spider_Pro [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)UtilMind [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URLGetFile [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)URI::Fetch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)UCmore [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)UdmSearch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)UMBC [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)UniversalFeedParser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)QuepasaCreep [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Vacuum [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)vayala [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)vobsub [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)vikspider [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)VCI [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)VoilaBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)voyager [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)VoidEYE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)w3mir [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Web\ Image\ Collector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Web\ Sucker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Web2WAP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebaltBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)webalta [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebCollage [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebAuto [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebBandit [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebCapture [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Webclipping.com [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebCopier [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebCopy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebEMailExtrac [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebEnhancer [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebFetch [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebFilter [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebFountain [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebGo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Web.Image.Collector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebLeacher [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebMiner [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebMirror [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebmasterWorldForumBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebReaper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebSauger [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebSnake [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)webshag [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Website [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Webster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebStripper [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebVac [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebWhacker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WebZIP [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)webwalk [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Wells\ Search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WEP\ Search [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WeRelateBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)wget [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WhosTalking [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Whacker [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)whatweb [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Widow [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Wildsoft\ Surfer [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WUMPUS [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WinHTTrack [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)winhttp [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WinHttpRequest [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WISENutbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WWW-Mechanize [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WWWOFFLE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)wwwster [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)WWW-Collector [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Xaldon [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)xxxyy [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)zermelo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Xenu [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)XGET [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)YahooYSMcm [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)YaDirectBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Zade [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)ZBot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)zerxbot [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Zeus [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)youda [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)Zyborg [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)zmeu [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^(.*)zune
RewriteRule .* - [F]


I hope any one of the above methods may fix your 503 service unavailable issue. Let us know which method fixed your issue through the comment section. If you like this article, please share this article. Want more blogging tips, follow BlogVwant on Facebook, Twitter and YouTube.