Views:

Applies to Product - Dynamics 365 Supply Chain Management


What’s happening?
A process serving application pool 'AOSService' suffered a fatal communication error with the Windows Process Activation Service. The error message indicates that the application pool is either not available or cannot respond at this time.
 

Reason:
The error message "The type 'SAMLTokenRequestValidator' is ambiguous" suggests a configuration issue where the type could originate from multiple assemblies, leading to a conflict. This can occur when the application pool crashes due to internal application errors.
 

Resolution:

  1. Check whether the application pool was automatically disabled because of related process failures.
  2. Backup all information in the folder containing the application files.
  3. Stop the Internet Information Services (IIS).
  4. Open the folder containing the .NET files and ensure all files and folders are intact.
  5. Restart the IIS and check if the issue persists.
  6. If the error continues, specify the assembly explicitly in the type name to resolve the ambiguity.

For further details, refer to the documentation on troubleshooting application pool crashes.