I started getting a new error message after the patch today; "your external IP address has changed," and it keeps me from being able to play at all. I can log in through the patcher, but get that error as it is loading the server/character select.

I know, for certain, that my external IP address has not changed and isn't changing. I have a static IP address, and I have set my internal IP on my router for this computer such that it is static as well.

I have never had this problem before, and I played last night. It's just been since the patch on 3/12/2011 that this has been a problem.

I did a search and found some old threads of people having apparently the same problem, but none offered any reasonable or workable solution.