Still on the WCF learning curve:

I've set up a self-hosted WCF Service (WSDualHttpBinding), which works fine on my own computer, which resides behind a firewall. If I run the client on my own computer, everything works great.

Now I installed the client on a computer outside my network, and I'm trying to access the service via a dynamic DNS, like so: http://mydomain.dyndns.org:8000/MyService. My port forwarding issues were taken care of in a previous question; I can now see the service is up in my browser.

But now when I try to run the client on the other machine, I get the following error message: "The open operation did not complete within the allotted timeout of 00:01:00. The time allotted to this operation may have been a portion of a longer timeout."

I have disabled security on the service, so that's not it. What else might be preventing the connection from happening?