I get the following error on all workstations in ZCM 11.1 Update 1?

"Unable to refresh the system settings from service"

If I open a web browser to that address, I get a certificate error (self-signed) and after accepting I see:

Web Service Deployed at
The following information is available:

WSDL document
Remote interface
Test service
Type mappings
Recent errors
Back to home.

Which seems like the service is working to me ... How do I get rid of this error?