When I had this issue in the past, it might have been the same thing maybe not. I could only get one instance connected to the same server at a time. I could connect both wow's to different servers but never to the same one.

The problem was in how my router handled NAT. I had to put my PC in the DMZ to solve the issue.


Ever since then I occasionally have to re-enter that screen on my router's config and hit 'Save' again, which reboots the router and fixes the fact that the problem randomly resurfaces about once every other week.