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Received CMD_ENDSESSION with reason: 26

Attempting to connect to remote I get nothing back in the dialogue (at least, it appears and disappears so quickly that it can't be read) but this appears in the log:

LoginOutgoing: starting authentication
IProcessCommandHandler[22]::CmdEndSession(): Received CMD_ENDSESSION with reason: 26

Both ends are up to date, my end is running Version 12.0.223866

Any ideas?

Thanks,  John Sutton