Cannot forward SSH (port 22) on Arris BGW210-700 gateway

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See forums.att.com/t5/AT-T-Internet-Equipment/port-barricade-22-port-range-conflicts-with-reserved-port-22/m-p/5509951

I solved this issue by changing my Linux server to listen on port 2222:

1. As root vi /etc/ssh/sshd_config
2. Locate the following line:
# Port 22
3. Remove # and change 22 to your desired port number.
4. Restart the sshd service by running the following command:
service sshd restart

5.  Create a custom rule on the NAT/Gaming tab for port 2222 to route to your server

I have the exact same problem. I have executed the steps here but I still can't initiate an ssh session from outside the network. Did you do something else not listed on the steps? 

Run this command on your server to see if the port is changed , I  changed to 2222:

netstat -na | grep 2222
tcp 0 0 0.0.0.0:2222 0.0.0.0:* LISTEN 
tcp6 0 0 :::2222 :::* LISTEN 

On a computer on the same network try SSH to see if it works.

ssh -p 2222 user@host

If you can't connect from the outside network, check the router port forwarding settings see example pic:

http://jerryjjansen.com/wp-content/uploads/2015/01/ATT-ARRIS-1.jpg

where port should be 2222 and device your server IP. Hope that helps!

I can ssh into the server if I'm on the local network. And I get this with the command:

tcp 0 0 0.0.0.0:2222 0.0.0.0:* LISTEN 
tcp 0 0 192.168.1.68:2222 192.168.1.70:34740 ESTABLISHED
tcp6 0 0 :::2222 :::* LISTEN 

So that is working correctly. 

On the router I have this configuration:

Do I need to restart the router or something?

I was able to make it work.

It turns out that the port forwarding is a 2-step process. Besides adding the custom service to the service list as shown in my previous post, I had to add the entry into the NAT/Gaming section and assign it to my server device.

This 2-step process was not very clear for me but now I know this is how it is done.

I also enabled IPv6 on my ssh server along with the port change. I did this by adding the following below the port configuration to the /etc/ssh/sshd_config file:

AddressFamily any
ListenAddress 0.0.0.0
ListenAddress ::

Now I can access from outside my server.

Thanks for helping!

I know I'm late but:

I'm pretty sure AT&T router manufacturers use a linux distro that already forwards 22 for itself.

You can try connecting with PuTTY and instead of a timeout, you will get a connection refused.