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01-05-2012 11:30 PM
01-05-2012 11:30 PM
ssh error in syslog
Hi,
I getting
sshd[18474]: channel_lookup: 0: bad id: channel free
sshd[18474]: Disconnecting: server_input_channel_req: unknown channel 0
- May I know it is ok to get those message?
- I have try google around, but cant get any information what does those message actually mean. Where can I get information on what does the message mean?
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- sshd
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01-09-2012 08:47 AM
01-09-2012 08:47 AM
Re: ssh error in syslog
1.) Maybe someone is connecting to your sshd and sending it bad data (or really anything that is not valid SSH protocol data).
It might be because someone has made a mistake and configured some application to connect to a wrong port.
It might be an enterprise monitoring system that is trying to see if your sshd is still running.
It might be a malicious person, sending bad data to try and make your sshd crash or let the malicious person log in without valid authentication.
2.) Only two ways:
- read OpenSSH source code (available at www.openssh.com). The HP SSH is a port of OpenSSH.
- ask OpenSSH developers or other people who really know the internal workings of OpenSSH.