I want to setup a ssh tunnel from SERVER A to SERVER C. However, SERVER C is not public and only accessible through SERVER B.

Now I have access to SERVER B, so I though I could setup a tunnel as follows:

$serverA> ssh root@serverB -L 9000:serverC:9000 -L 9001:serverC:9001 ... -fN

Now, although this command runs fine and I can see the port

$serverA> netstat -tulnp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.11:37192 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:9000 0.0.0.0:* LISTEN 11/ssh
tcp 0 0 127.0.0.1:9001 0.0.0.0:* LISTEN 11/ssh
tcp 0 0 127.0.0.1:9002 0.0.0.0:* LISTEN 11/ssh
tcp 0 0 127.0.0.1:9003 0.0.0.0:* LISTEN 11/ssh
tcp6 0 0 ::1:9000 :::* LISTEN 11/ssh
tcp6 0 0 ::1:9001 :::* LISTEN 11/ssh
tcp6 0 0 ::1:9002 :::* LISTEN 11/ssh
tcp6 0 0 ::1:9003 :::* LISTEN 11/ssh
udp 0 0 127.0.0.11:43149 0.0.0.0:* -

But I don't get any responses from these ports when I connect, for example:

$> telnet localhost 9001
Trying ::1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.

So the question is, is there something wrong with how I try to set this up. Should I make config-adjustments to SERVER B ? Any help would be appreciated!

Cheers

Does it work if you do the command individually? Without multiple `-L`?

No. See the following on how to ssh via a proxy.

http://www.linuxquestions.org/questi...sh-4175590163/

Thanks for helping. Right now I think it might be something with the ports being bind to 127.0.0.1 with the results that they are not accessible from the outside. Its still a theory

What are you trying to accomplish?

What service running on port 9000/9001 on server C are you trying to tunnel?