ssh times out trying to login to machine outside the LAN

[Joel Rees]

I'm pretty sure the ssh configurations are all pretty much stock. Just 
looked at the configuration files and didn't see anything that I can 
recall changing.

I can ssh in and out on the local LAN.

My cohorts at a different company say they can log in and out. (The box 
in question is at yet a third company.) They had the admin on the box 
in question check the logs, and that admin suggested that my company's 
firewall was to blame. (3rd information.)

So I brought my workstation home and set it running static local IP 
here, and NAT redirected port 22 to the workstation. Still get 
timeouts. But, as I say, I can ssh both in and out of the box on the 
local LAN, challenge, password, etc.

Any suggestions?