RiverWind wrote: > I used to be able to "ssh" from my shellworld account into my Linux > box before I got the latest version of the squeeze disk. I am not > able to do so now. Exactly what needs to be set up or in place in > order for me to once again be able to access my Linux box via "ssh" > or "telnet" from another site?
1. Ensure that openssh-server is installed.
$ dpkg -l openssh-server
ii openssh-server 1:5.8p1-7 secure shell (SSH) server ...
2. Ensure that sshd is listening on port 22.
$ netstat -na | grep '0.0.0.0:22'
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
3. Ensure that you can connect to the sshd port from the local host.
Do this on the local host.
$ telnet localhost 22
...
Escape character is '^]'.
SSH-2.0-OpenSSH_5.8p1 Debian-7
^] <-- Use Control-] to escape
telnet> quit <-- Then type quit to exit
4. Ensure that you can connect to the sshd port from the remote host.
Do this from the remote host.
$ telnet yourlinuxhost 22
...same as above... ...escape to command prompt and quit ...
If that fails look for a firewall that is blocking the connection.
# less /var/log/kern.log
5. Ensure that you can ssh to the remote host.
Do this on the remote host.
$ ssh yourlinuxhost
6. Increase debug level. Use one or two -v's to increase verbosity.
$ ssh -v yourlinuxhost
7. Look in /var/log/auth.log on host to determine why sshd failed.
# less /var/log/auth.log
8. Start your own debugging version of sshd and see all messages
inline.
# /usr/sbin/sshd -d -p 2222 <-- On the local host.
$ ssh -p 2222 yourlinuxhost <-- On the remote host.
If any of the above steps fail then stop there and fix that part
before proceeding further.
Bob
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