SMT Management - Host Status Unknown

We have successfully deployed updates to our remote servers. From the SMT Console we see all our hosts with a status of “Unknown”, but when running the command “zypper list-updates” locally on the host, we know that all the updates have been installed, and when running the command “zypper lr -U” we see a successfully connection to the SMT Server Repo.

Any ideas how to the get the Host status changed?

Our SMT Server and hosts are running SUSE 12-SP3.