Ssh – Failed For Listen Port 80 (Serveo and SSH)

domainport-forwardingsshssh-tunnel

I am trying to create a very simple one page website hosted on my PC. I have used Python and SimpleHTTPServer to host the server on localhost:8080 and am now trying to forward traffic from a domain to localhost. For this I am using
Serveo. Everything works great when I use this command to forward the ports:

ssh -o ServerAliveInterval=60 -R 80:localhost:8080 serveo.net

But the moment I include my domain and run this command:

ssh -o ServerAliveInterval=60 -R mydomain.ml:80:localhost:8080 serveo.net

I get this error:

Warning: remote port forwarding failed for listen port 80

I have done some research on the error and found that it is mostly caused by something else using that port, but there is nothing else on my PC or at the domain. In the DNS Manager of my domain I have made sure that I have an A record that points to 159.89.214.31 and a TXT record with the fingerprint of my SSH key as needed by Serveo.

What could be causing this problem and how can I fix it?

Best Answer

The problem solved itself just by waiting, I belive the DNS Manager was still in the process of setting the records.

Related Solutions

SSH – Bad Owner or Permissions on ~/.ssh/config

I needed to have rw for user only permissions on config. This fixed it.

chmod 600 ~/.ssh/config

As others have noted below, it could be the file owner. (upvote them!)

chown $USER ~/.ssh/config

If your whole folder has invalid permissions here's a table of possible permissions:

Path	Permission
.ssh directory (code)	0700 (drwx------)
private keys (ex: `id_rsa`) (code)	0600 (-rw-------)
`config`	0600 (-rw-------)
public keys (*.pub ex: `id_rsa.pub`)	0644 (-rw-r--r--)
`authorized_keys` (code)	0644 (-rw-r--r--)
`known_hosts`	0644 (-rw-r--r--)

Sources:

openssh check-perm.c
openssh readconf.c
openssh ssh_user_config fix_authorized_keys_perms

Ssh – Selecting Interface for SSH Port Forwarding

From sshd_config(5):

GatewayPorts

  Specifies whether remote hosts are allowed to connect to ports forwarded 
  for the client.  By default, sshd(8) binds remote port forwardings to the
  loopback address. This prevents other remote hosts from connecting to 
  forwarded ports.  GatewayPorts can be used to specify that sshd should 
  allow remote port forwardings to bind to non-loopback addresses, thus 
  allowing other hosts to connect.  The argument may be “no” to force remote 
  port forwardings to be available to the local host only, “yes” to force 
  remote port forwardings to bind to the wildcard address, or 
  “clientspecified” to allow the client to select the address to which the 
  forwarding is bound.  The default is “no”.

You want to set this to clientspecified instead of yes.

Best Answer

Related Solutions

SSH – Bad Owner or Permissions on ~/.ssh/config

Ssh – Selecting Interface for SSH Port Forwarding

Related Topic