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- Scott Rochford
January 15, 2004, 12:07 pm
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Has anyone else observed an issue where PuTTY's pscp.exe connection
hangs indefinitely after transferring files to an OpenSSH server?
I have seen this using PuTTY 0.52 from two Windows 2000 Server systems
to OpenSSH 3.5p1/Solaris 8 and OpenSSH 3.6.1p2/Red Hat Linux 6.2EE. I
am using SSH2 and DSA public key authentication.
Eventually after about 10 connections have hung further SSH
connections of any type are refused with the message:
ssh_exchange_identification: Connection closed by remote host
The connections still show as ESTABLISHED in 'netstat -a', and
pscp.exe processes continue to run at the Windows end.
Since the problem is difficult to reproduce reliably I have not been
able to capture 'sshd -d' output yet. I haven't located a similar
complaint in the PuTTY Wishlist or OpenSSH's Bugzilla.
Any assistance or advice appreciated!
- Richard E. Silverman
January 17, 2004, 7:17 pm
Re: PuTTY pscp to OpenSSH connection not terminated
SR> Eventually after about 10 connections have hung further SSH
SR> connections of any type are refused with the message:
SR> ssh_exchange_identification: Connection closed by remote host
This means the server is immediately closing the TCP connection without
engaging in the SSH protocol. Usually this indicates a libwrap
misconfiguration, but that's not the problem here since previous
connections are succeeding. So, it suggests some sort of problem on the
server which is preventing sshd from getting started -- use syslog,
debugging output, or process tracing to find out what sshd is doing in
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