ssh to 2003 server exist immediately

[* *]

You might try reconfiguring with "privilege separation" turned on.
Also, turn on auditing of failed file access, and/or run sysInternals
RegMon and FileMon.

I think your sshd_server user doesn't have permission to execute
Winsock2 which is %SYSTEMROOT%\System32\ws2_32.dll or one of it's
dependencies.  Did you also check the Application Event Log?

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