Putty/OpenSSH on Windows - Crash Port Forwarding

From: Didier Wenger (didier.wenger_at_lodh.com)
Date: 12/22/04 

Date: Wed, 22 Dec 2004 14:10:14 +0100

Hi there,

I've got a Windows OpenSSH server behind a NAT DSL router and I'd like to
use Putty's port forwarding feature on an XP client trough the Internet to
reach a mail server that sits behind the NAT. The SSH connection is OK, the
port forwarding is working fine as I can telnet to the desired port (POP3)
but I can't retrieve my mails because the connection always crashes. Even
when I try to FTP to a server behind the NAT, I can successfully login but
then when I try to list a directory, the FTP connection freezes and a couple
of minutes later I receive the world famous time out message, Putty is then
in a strange state and I can't exit the terminal Window, I have to kill it.

To me, it looks like Putty can't handle the traffic being requested and
simply drops the connection. Anyone has ever deal with this problem, is it a
misconfiguration on the serverside ? I had the same problem when my SSH
deamon was running on a RedHat 8.0.

Thanks in advance for your suggestions and merry X-mas to all of you,
Didier