The real question is this. I know turning off STP can be dangerous, but my switch is actually connecting via one cable into the wall. Where it goes from there I'm not sure as I only manage the servers and PCs connected to my switch.
One day it stopped working and that's the error that showed up. Before then I was using it unmanaged and it was working fine.
If I can just disable STP, will that solve my problem? If not, what do I have to do to make this work? Each port connects to a machine on a different subnet, but they all got to the outside world over the same port connected into the wall. Each network has its own default gateway but I think they're virtual (I didn't set that up) so they all eventually end up at the same place. Any ideas?