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RDCMan v3.21 crashing
Getting the following error System.NullReferenceException: Object reference not set to an instance of an object. at RDCMan.Nodes.Server.Dock() at RdcMan.ServerForm.OnClosed(EventArgs e) at Syste...
That's a bug in RDCMan, not something you've misconfigured nothing on your side will fix it.
Workarounds in the meantime : Dock the session before rebooting the remote host, so no orphaned undocked window exists when it comes back. bu If it's already orphaned, close the stale undocked window first, then reconnect from the tree. The crash needs two live windows bound to the same server. and finally Use the Reconnect command on the node rather than clicking inside the dead undocked window, so RDCMan reuses the existing session instead of spawning a docked one.
And save your .rdg before you experiment, since Quit is your only exit from that dialog.