What Is This Issue?

> This is a common issue which happens to the websites hosted on IIS.
> This occur when the application pool of the hosted website may be stopped.
> The error message will be shown as in below figure if the application pool is down.

How To Resolve This Issue?....

> On Run Command Window, type inetmgr to open IIS and Select your website.
> Right Click on the Website --> Manage WebSite --> Advanced Settings.
> A new windows will be opened where you can find the settings for that website.
> On the General Section, note down the name of Application Pool.
> Now on the left panel of the IIS, click on the Application Pools Node at the top.
> Select the earlier got Application Pool from the Features View.
> You can see the application pool is stopped now.
> On the right Action panel, click on the start link for starting the application pool.



> This would definitely resolve the issue
> Else please refer the following link.
> HTTP Error 503. The service is unavailable - Solution 2

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