IIS Detailed Errors
If the server module is throwing an error it is required to enabled detailed error messages in IIS so they are displayed when the error is hit.
To enable this feature, perform the following:
a. Open the IIS console and natigate to the CRM application.
In this image you see 2 options
b. Double-click the Error Pages option marked (1) in the image above and set
Click 1 and in the dialog set the item 2 and click 3 to save
c. Double-click the ASP option marked (2) in the top image
Click 1 and set to true.
Items marked 2 and 3 are recommended settings so while here set those.
Save those options and you should now see more detailed information on any errors.