error Server Application Unavailable

if in your .net web application 3.5 framework occurred error like " Server Application Unavailable " this. just reset iis server version. run bellow command in run or command window. %windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis -i to see framework dll run bellow command %windir%\Microsoft.NET\Framework by above command you can see all registered framework version dll.

If bellow error occurred ………

see image in doc file

error is below 

Server Application Unavailable

Solution is below…..

Run below command in run …. Or command …..

%windir%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis –i

Above command reinstalled iis server version.

If you want to see Framework of installed on server.…

%windir%\Microsoft.NET\Framework

 

 

After run command your issue is solved.