If you see the message Server Error in '/adfs' Application in the client's browser, you can verify the ADFS log file to find the cause.
To enable logging, perform the following steps:
In the ADFS console, right-click Federation Service > Properties.
Select Troubleshooting and select all options on the page.
Click OK, then look for the file that is created in the path listed in the Log files directory.
Look in that file for the reasons of the issue.
For an explanation of some of the common errors, see Common Errors.