stsservice.dll is part of , which handles authentication and token issuance in vSphere environments (especially vCenter Server 6.x and later). RVTools relies on VMware’s .NET libraries to communicate with vCenter; problems with this DLL often point to authentication or API communication failures.
Windows AppLocker or insufficient NTFS permissions on the installation folder can block the execution of required .dll files like STSService.dll . How to Fix RVTools Unknown Error STSService.dll
Corrupted user profiles can cause bizarre DLL loading errors.
The error is fundamentally a connection failure. Verify the following:
If re-registration fails or does not help, remove the shared components that contain stsservice.dll .
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