I've tested the first several Mission Map portals, as well as some others at various places throughout the game realm and I've found that they all seem to work properly on my end.
I understand some users have been having issues entering some of these portals, getting an error message having to do with the server. My guess is that this has something to do with the extra strain on the server caused by so many users starting new characters and trying to enter these maps at the same time. Mind you, that's just a guess.
At any rate, if there are any more reports of this issue, please post them in this thread so we can check the maps in question and see if there is indeed an issue.
Edited by Rimmy, 05 September 2011 - 06:54 AM.