After upgrade (ssh) putty hangs.

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Hi all, finally I upgraded ssh from version 2.9p1 to 3.7.1p2 on my linux
Now i have some troubles to solve, that i never had using v. 2.9p1.

It always happens that when i log into Slackware ssh box from putty (on
Windows 2000) - after an unpredictable amount of time (seconds,
minutes.. it depends) - the terminal hangs, stop responding (the output
of a ping, top or other commands is blocked, and various ctrl-c, ctrl-d
  have no effect).
Sometimes keeping a key pressed helps to unlock the situation, for some
minutes again, then -> freeze.

So i tried to open two putty terminals in which execute 'top' command to
see the cpu load on ssh server during the block; cpu don't stop to idle..

Even if many other users on the newsgroup have similar symptoms, they
can't kill the putty window; i haven't that issue, i'm able to kill the
window using 'X' button, so - even if i'm not an expert - i guess that
the roots of problem reside in a different place.

Can you help me?
Did i make something wrong during the upgrade process? I'm using the
same config files that were used with ssh 2.9p1.

If you need more info, i'm glad to give them.

Thanks for any help,

paolo@ns1:~$ ssh -V
OpenSSH_3.7.1p2, SSH protocols 1.5/2.0, OpenSSL 0.9.6b 9 Jul 2001

Putty version is 0.54

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