With the gui of Secure Shell client under windows7, when you try to add outgoing tunnel it crashes and windows tell you that program will be ended.
Solution :
go to C:UserswitrApplication DataSSH and edit your profile XXX.ssh2 with simple text editor
you must find your declared incoming tunnel like so :
…. [Outgoing Tunnels]
[Incoming Tunnels] Tunnel=S:witrTunnel,1521,localhost,1521,0,tcp ….