A little bit of investigation done myself, it looks like /usr/share/webmin/servers/logout.cgi is trying (and failing) to delete a cookie which is related to the log-in session for the linked-to server.
Is this an unreleased feature? It doesn't appear to be available to me... All I have is a button which takes me back to the "Webmin Servers Index module on the Master server" in place of where the logout button is on the master server. In any case, I'm talking about the server icons on the Webmin Servers Index page.
Webmin Servers Index "logout" link does not work
Also experiencing the "connection error"/"server maybe busy"/"unable to communicate with sserver" error
Havent checked the start/stop scripts so i cant comment on that As for theconfig path, where is ......./??
Where is this configuration located? I believe I have hit the same issue (I can't get it to load even after waiting a few minutes though). Just as an extra, using telnet and hand crafting a HTTP request for (index) / doesn't return any response at all either....