The following error is seen after installing a Windows OS patch on the OneClick server:
"No SpectroSERVERS available"
Nothing else has changed in the environment.
Release: Any Spectrum release running on Windows
Component: SPCOCK
It is recommend the Windows patches be matching on the two OSs. In this case the OS patching did match.
The bigger problem was solved by a reboot of the SpectroSERVER after the OneClick came online. This caused communication to work correctly.