Logging into a computer behind a router?

[Gregory D Hough]

Alex Maynard wrote:
> 
> 
> Thanks very much to several of you who suggested forwarding port 22.
> I've done this and can now get to my computer's logon/passord from
> outside, but strangely it rejects my logon attempts.
> 
> I use the "AllowUsers" in sshd_config to restrict outside access.
> In the past when I had trouble logging in from outside computers it was
> because the IP/DNS was not listed under AllowUsers. But this
> outside computer is a reliable server who's DNS has been on my AllowUsers
> list for a long time and never caused a problem before.  This has me a
> bit confused.  Could it be that the DNS/IP of the computer of origin is
> somehow getting losted or changed as it passes through my router?
> 
If you're getting a login prompt at a remote location, then it is most 
likely NOT a networking issue. You're being rejected for some other 
reason by the application itself. What about the users .ssh/known_hosts 
file? Does it already have a key for the remote host? Has it changed?

Try providing some more info. Check the logs and root's mail for any 
errors and if possible tcpdump -npvvvxX both sides of the session. See 
if the key exchange was successful and that the versions aren't too far 
out of whack.

greg
> Thanks again!
> 
> Alex
> 
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