Problems connecting to servers through tunnel

Hi,
I'm trying to SSH into one of my servers (running Fedora Core 4) from
my laptop (again, FC4). I'm sitting behind a HTTP proxy, and am using
Proxytunnel to tunnel through it. This works fine for connecting to my
machine at home, but when I try and connect to one of my webservers, it
fails.

The problem is, after the initial OpenSSH "Are you sure you want to
continue connecting?" message, the connection goes dead. After about a
minute, the client disconnects with a "broken pipe" error (read as: the
proxy has dropped the connection because it's been idle for too long).
This only affects the two FC4 servers - I've got another server running
Debian Sarge and I can connect to that fine.
I've catted the sshd_config files from one of the servers through sort
and done the same on the server I can connect to - the only major
differences I can see are (NC = server I can't connect to, CC = server
I can connect to):
ChallengeResponseAuthentication is set to 'No' on NC, 'Yes' on CC
GatewayPorts set to 'Yes' on NC, line commented out on CC
GSSAPIAuthentication set to 'Yes' on NC, line commented out on CC
GSSAPICleanupCredentials set to 'Yes' on NC, line commented out on CC
PasswordAuthentication set to 'Yes' on NC, line commented out on CC
PermitRootLogin set to 'without-password' on NC, set to 'No' on CC

All the machines are set to Protocol 2,1 (try SSH2 first, then fall
back to SSH1).

The two servers I can't connect to (and the client) are running
"OpenSSH_4.2p1, OpenSSL 0.9.7f 22 Mar 2005", while the server I can
connect to is running "OpenSSH_3.8.1p1 Debian8.sarge.4, OpenSSL 0.9.7e
25 Oct 2004".

Can anyone suggest some things I could check to try and track down this
problem?
I've sniffed the connection with Ethereal and can't see any traffic
after the initial host key exchange - the connection goes completely
silent.

Thanks,
Phil.

.

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