HTTP Error 503. The service is unavailable.

HTTP Error 503. The service is unavailable.

Reason behind the error :-

This error comes when the default application pool is stopped or else  when the applicationhost.config and administration file are corrupted.

Solution :- This error can be resolved by starting the DefaultAppPool  from the IIS  but  some times even after starting the DefaultAppPool   from the IIS  the error will not get resolved .It is happened  when  both of the applicationhost.config and administration file are corrupted but luckily when we restarted  the iis , the iis will take the backup of  both applicationhost.config and administration  files and stored   on C:\inetpub\history folder   and  from this folder we can take the  copies of both files and replace in  to config folder (C:\Windows\System32\inetsrv\config)

HTTP Error 404. The requested resource is not found.

HTTP Error 404. The requested resource is not found.

Problem :

When you browse with localhost then iis defualt webpage will not come .

Solution :- Start the website by click on start button.

The Request Failed with Http Status 405 : Method Not Allowed

The Request Failed with Http Status 405 : Method Not Allowed

This issue will come when our default application pool framework will not assigned to any framework.

In order to change the framework of the default application pool ,just double click on DefaultAppPool and select the .net framework version with v2.0 and then restart the iis .

HTTP ERROR 404.3 -Not Found

HTTP ERROR 404.3 -Not Found 

You are trying to access your WCF web service on IIS7 or higher and receive a 404.3 error stating the folowing:

HTTP Error 404.3 - Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

In the iis when you are trying to browse any service like .svc or any .config file the system will open that page .

solution :- Install WCF support as following:

Open the command prompt and paste the  following command

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"%windir%\Microsoft.NET\Framework\v3.0\Windows Communication Foundation\ServiceModelReg.exe" -r -y

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