NTLM Access token size is too small.
The token size (MaxTokenSize) value in the Windows registry was increased.
Instead of using a domain account, create a SQL Server account to monitor the affected SQL Server Instance. Assign all the required permissions.
Please note: Quest does not provide support for problems that arise from improper modification of the registry. The Windows registry contains information critical to your computer and applications. Make sure you back up the registry before modifying it. For more information on the Windows Registry Editor and how to back up and restore it, refer to Microsoft Article ID 256986 “Description of the Microsoft Windows registry” at Microsoft Support.