Disconnecting LAN from systray?

[Ed Greshko]

F15.  I've the Network Management Icon in the systray.  Clicking on it 
pops up a display showing on the left "Interfaces" and the right 
"Connections".

In the Interfaces is my LAN interface.  In the upper right is a small 
red X.  When I mouse over it, it displays "Disconnect".  However, 
clicking on it has no effect.  I could not find any buy related to 
it...but I've been known to be a notoriously bad searcher.  :-(

Is this a known issue or some thing amiss at my end?