OK …
Maybe I was a little bit too fast. I have no SHH-host available outside my own network, so there could be an issue that I can't reproduce. Buit if there is it must be an issue with the SSH-tunneling-daemon running on your lokal port locking hostname “localhost”.
But I have now tried with a dyndns-setup to my own SSH-server and still can't reproduce.
Could we se ALL tabs in the connection manager for the two connections ?
(you may 'paint' ip's etc.)