sshd log & "Could not write ident string"

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I'm using openssh-3.7.1p2-2 in cygwin in win2000. I install the sshd as
win2k service. My questions :

(1) No sshd activity is logged in /var/log/sshd.log. Why ?
(2) I could ssh login locally (i.e. ssh localhost  or ssh my_machine_ip ).
But when I try to login from a remote machine, it fails. In the remote
machine, the ssh client report "Connection timeout". In the win2k event
log, it says "sshd : PID 420 : Could not write ident string to".  The remote machine is behind a firewall, so I think the is the firewall is IP. Does it mean that the firewall block
the ssh traffic ?

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