[SOLVED] ssh port 22: Connection timed out (ubuntu 10.04)

drkayak · 03-04-2012, 12:33 AM

I replaced my old desktop with a Dell XPS 8300, on which I installed ubuntu 10.04 (obliterating the Windows partition). I can ssh out from the host to other computers, but I can't ssh or telnet in to the host from outside, always getting the message 'ssh: connect to host ... port 22: Connection timed out'. The host is behind a router on which I'm sure I have port 22 forwarded. I do have 'sshd' running on the host.

This is from the host:

$ ping xx.xx.xx.xxx # works
$ ssh localhost # works
$ ssh -vvv xx.xx.xx.xxx
OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /home/paul/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to xx.xx.xx.xxx [xx.xx.xx.xxx] port 22.
debug1: connect to address xx.xx.xx.xxx port 22: Connection timed out
ssh: connect to host xx.xx.xx.xxx port 22: Connection timed out

$ telnet xx.xx.xx.xxx 22
Trying xx.xx.xx.xxx ...
telnet: Unable to connect to remote host: Connection timed out

$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

$ sudo lsof -i :22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 830 root 3r IPv4 4034 0t0 TCP *:ssh (LISTEN)
sshd 830 root 4u IPv6 4036 0t0 TCP *:ssh (LISTEN)

$ nc -vv xx.xx.xx.xxx 22
nc: connect to xx.xx.xx.xxx port 22 (tcp) failed: Connection timed out

This is from the host's owner: I'm at my wit's end!!

lithos · 03-04-2012, 02:21 AM

Quote:

Originally Posted by drkayak

....
I can ssh out from the host to other computers, but I can't ssh or telnet in to the host from outside, always getting the message 'ssh: connect to host ... port 22: Connection timed out'. The host is behind a router on which I'm sure I have port 22 forwarded. I do have 'sshd' running on the host.

....

Hi,

for the 1st step I would try to stop firewall (# service iptables stop) to see if there might be a problem with firewall

then 2nd step I would try to change the SSH port connection to the host with
# ssh -vv -p 2121 x.x.x.x
of course it means that you need to change the port in sshd_config too to accept connections on different port

If that is the case it works, then your ISP might be blocking port 22 (and probably 21, 80 etc.)

good luck

drkayak · 03-04-2012, 10:17 AM

Aaarrggh! I found the problem, after many hours. Prompted by lithos' comment, I took a close look at the port forwarding page on my router. The IP address there appeared as 192.168.1.101, and you have the option of replacing the last 3 digits. I had tried 100, 101 and 102. It occurred to me to check 'ifconfig' on the host, where I saw inet addr:192.168.1.103 . I typed in '103' on the router page, and was then able to connect via ssh. I hope some poor soul can benefit from this in the future.

lithos · 03-04-2012, 10:54 AM

Great,

so could you mark the thread solved for future references (see my signature how ).

Best Regards.