If the error occurs exclusively during background automation, scheduled tasks, or under specific service accounts, it is highly likely an execution restriction policy. Open your editor ( secpol.msc ). Navigate to Application Control Policies > AppLocker .
Navigate to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319
Ensure the machine running RVTools can successfully ping the fully qualified domain name (FQDN) of your vCenter Server. IP address logins can sometimes fail if the SSO certificate is strictly bound to the FQDN. rvtools unknown error stsservicedll free
Expired STS Certificates: A common vSphere issue where the internal identity certificates have expired, preventing any SDK login.
When Active Directory authentication handling breaks inside STSService.dll , bypassing Windows Integrated Authentication provides a reliable workaround. Switch your execution syntax from pass-through auth to explicit credential routing: preventing any SDK login.
If you've tried adjusting the working directory and the error persists, the root cause may be deeper. Here is a systematic approach to diagnosing and fixing the issue.
RVTOOLS can connect directly to an ESXi host instead of vCenter, bypassing the STS service entirely: or under specific service accounts
Only pull installers directly via Dell Support KB 000325532.