Defender for Identity Sensor throwing seemingly internal errors

Hey folks,

today I installed MDI sensors on some Windows Server 2022 DCs with .NET 4.8 installed. All of the setups ran just fine, however two of the DCs threw the following errors.

DirectoryServicesClient System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task'

DirectoryServicesResolver System.MissingMethodException: Method not found: 'Void Microsoft.Tri.Common.UpdateDirectoryServicesClientAccountIdsRequest..ctor

Both of those errors made me scratch my head so hard my hair fell out. Maybe some of you guys have had this issue before.

BR Felix

EliOfek
Apr 25, 2022
This is what I suspected.
Something installed on the failing one the assembly with this specific version:
4.0_4.0.2.0
this shouldn't be there.
if you uninstall this version from GAC the sensor should work.
The problem is that I don't know which app decided to install it there and it might break if you remove it.
What 3rd party apps do you have there which are not on the working machine ?

See here for instructions how to correctly uninstall this assembly for this specific version (the other one should remain there)
https://docs.microsoft.com/en-us/dotnet/framework/app-domains/how-to-remove-an-assembly-from-the-gac

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Defender for Identity Sensor throwing seemingly internal errors

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