Can't telnet after ssh

Larry Hall
Mon Jan 17 21:07:00 GMT 2005

At 03:23 PM 1/17/2005, you wrote:
>I'm having a strange problem that started after updating cygwin to the
>current version. After ssh'ing to my system, I can't telnet elsewhere.
>The telnet process simply quits - it doesn't return any error message,
>and doesn't connect. A simple 'telnet' command drops me back at the
>I'm running sshd with privilege separation enabled. I can connect with
>passwords or key-based authentication just fine.
>Once connected, I can do most things. I can ssh somewhere else, ping,
>cp, mv ... most basic commands work. Everything within the cygwin
>package appears to work (although I haven't made an exhaustive search.)
>Most win32 commands appear to work also. Ping, nslookup, etc. The
>notable exception so far is telnet.
>Telnet works just fine through a local bash or cmd.exe.
>Windows XP
>cygwin: 1.5.12-1
>base-files: 3.2-1
>openssh: 3.9p1-2
>openssl: 0.9.7e-1
>I've uninstalled all packages, removed the /cygwin directory, and
>re-installed just the base, with no change. I've un-installed sshd and
>re-installed with 'ntsec', and 'ntsec tty'.
>Any suggestions?


>Problem reports:

Also, what did you set $CYGWIN to for sshd (you'll have to look in the
registry for the settings if you don't remember - i.e.

cat /proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/sshd/Parameters/Environment/CYGWIN


Larry Hall                    
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     

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