I've had it installed for a few months now and things have always worked. Randomly this morning, I couldn't get into OMV. I checked the GUI, and was receiving this error.
I used omv-firstaid, retyped in the same info, marked it static ip, and now the "network unavailable" no longer appears, but it's still not properly working. I can ping the server, Sab boots up and I can navigate there, but Emby doesn't work along w/ a few others. Also, after I attempt to log into the Web interface, it just flashes and nothing changes.