HTTP Error 500.23
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This error 500.23 translates to - An ASP.NET httpHandlers configuration does not apply in Managed Pipeline mode.
Check the httpHandlers configuration in IIS. Try following:
1. Open Server Manager
2. Select Roles>Web Server (IIS)>IIS Manager>Select the Server>Applocation Pools
3. Select the appPool that your asp.net app is running under>Click on 'Advanced Settings' from the right hand pane.
4. Under Advanced Settings>General>Managed Pipeline Mode, select "Classic"
5. Recycle app pool and test your app.