This is a real pain because I had to manually unplug ethernet cables for network testing or to use an alternate network or guarantee physical access to one network segment is cut off. 

For some reason this happened after I killed dbus because it was confused and blocking packets thinking they were coming from the wrong interface since eth0 and eth1 both had the same subnet and gateway.

I eventually did a "service network-manager restart" but the option was still grayed out until hours later the option returned and I could click disconnect.

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