New to Minin and a question regarding MinimWatch - MininServer

[simoncn]

Seeing a MinimWatch green icon for a time and then seeing it change to grey is caused by an issue with UPnP device discovery on your network. This can be related to the IGMP snooping setting in your router. It is not caused by a firewall setting in Ubuntu as this would cause the icon to be grey all the time.

For a more detailed explanation and some suggestions for solving the problem, see this page.