SCVMM 2012 add host error 406

Bumped into error message while trying to add a physical workgroup host to SCVMM 2012:

Access has been denied while contacting the server xxx
1. Verify that the specified user account has administrative privileges on xxx
2. Verify that DCOM access, launch, and activation permissions are enabled on xxx for the Administrators group. Use dcomcnfg.exe to modify permissions, and then try the operation again.
ID: 406

the solution was to run "winrm quickconfig" as administrator on the target server.