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SSH Tunnel Error: channel 3: open failed: administratively prohibited:

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The goal is to enable Firefox (on Ubuntu 16.04) to remotely ssh-tunnel and administer the Merline home router. The command:

ssh -D localhost:3000 user@myfqdn.asuscomm.com

connects a BASH terminal to the SSH server (on the router).

Firefox network settings was configured per [instructions][1]:


Attempts to tunnel traffic through browser (http://www.whatismyip.com) return "unable to connect" and BASH returns multiple instances:

> channel 3: open failed: administratively prohibited:

What is the root cause of the message above and what is the corrective action?

Router (SSH Server) Configuration:

- SSH hosted Asus router with Optware installed
- unable to locate [sshd_config][3] `find . | grep -i sshd_config`

[1]: https://ubuntuforums.org/showthread.php?t=723025
[2]: https://i.stack.imgur.com/OjXgT.png
[3]: https://serverfault.com/a/535425

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