This solution is fix the error message whole hosting .NET website in IIS.
Description: An error occurred during the processing of a
configuration file required to service this request. Please review the specific
error details below and modify your configuration file appropriately.
Parser Error Message:
|[No relevant source lines]
Source File: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config Line: 276
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:
Verify the machine config and find the assembly mentioned on that line number. Make sure the assembly version installed on the machine is same as the one in the web.config file.
Alternate solution is to Remove Identity node on web.config