I upgraded the following webmin module (through CM) and now one systems shows "Webmin down" status.
Jun 25 09:59:35 Updated: 2:wbm-server-manager-4.6-1.noarch
Webmin is up and running on that server as I can connect to it directly, login, etc. The error message is
Detailed status error Webmin failed to complete in 20 seconds
System load is
10:26:45 up 8 days, 11:35, 1 user, load average: 0.64, 0.68, 0.73