Cygwin sshd key auth doesn't work (seteuid 500: Permission denied)

Larry Hall (Cygwin)
Fri Nov 14 23:04:00 GMT 2008

Tomàs Núñez wrote:
> Hi
> I am trying to connect to a Cygwin sshd server using key authentication, 
> but I can't. When I use password authentication, it works great, but I 
> need to run some unattended processes, so key auth is mandatory.
> When I try to connect, I get that:
> user@workstation:~/.ssh$ ssh administrator@server -o 


> sshd: PID 8272: fatal: seteuid 500: Permission denied.

Did you configure your SSH installation with ssh-host-config?  How
about your user with ssh-user-config?

> When I run ssh daemon as a user, in order to debug, I get that:
> user@server ~/$ /usr/sbin/sshd.exe -d

Ugh!  This suggests that you have not read OpenSSH readme in
/usr/share/doc/Cygwin.  You can't do this without screwing up all
the permissions on various directories and files that SSH checks
the permissions of.

> debug1: temporarily_use_uid: 500/513 (e=400/401)
> seteuid 500: Permission denied
> debug1: do_cleanup
> I've also tried to run sshd with strace, but I've found nothing (logs 
> are 412KB, that's why I don't attach them).
> Does anyone use key auth with cygwin sshd server?

Of course!

> Any hint about this issue?

Sure.  See the problem reporting guidelines below.  You've told us
what you're having problems with and it's obvious that you misunderstand
what's necessary to get pubkey authentication to switch users but what's
not clear is how you've set this up, what you're working with, and what
your intentions are.  I'd recommend that you review the docs and email
archives to come up to speed.  Then, if you're still having problems,
contact the list again with a follow-up problem report.

> Problem reports:

Larry Hall                    
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746


A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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