Zoning portal issues

For some reason whenever I hit certain zoning portals I instantly error 7.

I can have no lag at all, running smooth as silk, but when I go into a zoning portal I instantly error 7. It gets quite annoying, as I'm an officer in my guild and I'm expected to help others, but when I can't zone it leaves me kind of useless.

So far the two main portals that have given me trouble are the portals leaving Zin Ku Corridor area--going into Pongmei Valley, and the one going into Marketplace from the Byway.

I've taken my necro through the Pongmei Valley portal about 8 or 9 times now, and every single time I have error 7'd out of the game when I or someone else tries to zone through.

I've restarted, reset my modem, reset my router, reset my IP.. done everything I could think of to fix the issue that I'd think would fix it, but nothing can be done on my end, methinks.

Is anyone else having this kind of trouble? Anyone know how to fix it?

System specs?

Hm...first thing that comes to mind is, uninstall Guild Wars, reinstall it, test.

If that doesn't do anything, then find the ports GW uses, open them. If your using a router, disconnect it, and use a phone line --> modem --> computer connection, test and then post back.