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I am getting 'HTTP Error 503. The service is unavailable.'

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Cause : This error is encountered when application pool of website is stopped or all queue request is full of  application pool.


Resolution :


Log into your server via remote desktop.


Click on Start – Run – Type  inetmgr – Press enter key.


Expand IIS – click on application pools  – Start application pool if it shows stopped


Or right click on application pool and click on recycle.



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