channel_setup_fwd_listener: cannot listen to port

1 Nov 2013 12:24 ssh

I was attempting to use SSH to set up a tunnel (to our build server) this morning, so I typed the following:

ssh -L8080:localhost:8080 jenkins

…only to be greeted with the error:

bind: Address already in use
channel_setup_fwd_listener: cannot listen to port: 8080

Most odd. I’m pretty sure I don’t have anything else listening on that port, but I confirmed it with a quick netstat -anpt. Nope. Nothing listening on the port.

More strangely, with the SSH session open, I can go to http://localhost:8080 and see Jenkins. When I close the SSH session, I can no longer get to the page.

Lightbuild goes on

I’ve got the following in my ~/.ssh/config file:

Host jenkins
  LocalForward 8080

Doh! SSH itself had already opened the port, and was complaining that it couldn’t do it a second time.

A simple ssh jenkins was enough.