Someone else using WHTV recently had a problem too, but I don't think it was followed through. They may or may not be blocking p2p (check link below)
http://www.woolsock.ca/geeklove/2006...have_some.html

If your test page can't be displayed, something's blocking the default LW port.
You could try changing ports to a higher one, say 64049. You'll have to change LW's listening port (tools > options > advanced > firewall config. Apply to save a change) & also any ports allowed within your software firewall.

You'll need to find out your router's brand & model as it might be useful when trying to get rid of that firewall Have a look on the router & also underneath.