[Gllug] ssh problem doing my head in

[Tom Schutzer-Weissmann]

I cannot ssh from my linux box at one of the places I work. After 
authentication the thing just hangs.

From what I can discover, the problem could be: the host I'm connecting to has 
a problem (but I've tried lots, and I can connect to them from elsewhere), 
DNS is badly configured (maybe), or a router en route can't handle tcp 
windowing correctly - http://kerneltrap.org/node/6723

I _can_ connect fine using putty on Windows. Does that mean I can assume that 
the DNS setup is ok? The other thing I checked is that a reverse lookup of 
the public IP address gave me a hostname that resolves to the same IP 
address. It does, is that enough to discount DNS?

So perhaps that leaves the TCP windowing issue. I've tried the workaround, 
which is

# echo 0 > /proc/sys/net/ipv4/tcp_window_scaling

It doesn't make any difference. I even logged into the router and did the 
same, plus ca change.
I'm stumped! Any suggestions gratefully received.

Regards,
Tom SW
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