[OT] How to Diagnose Problem Inboud Connect Through Router?

[Stephen]

I have set up OpenSSH on my Linux server and Putty as a client on my 
Windows laptop.

They connect just fine at home.

I set the router's firewall to forward port 22 to the Linux server.

I can ping the router just fine. But I get unable to connect errors when 
trying to connect using SSH.

How can I diagnose this?

I am thinking that I connect the laptop to the WAN port on the router, 
hard code IP's for the wan port and the laptop and go from there. Am I 
on the right track?

Thanks
Stephen
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