I get a mage armor visual effect and messages in the combat log whenever I'm on the surface and someone tries to teleport me, but I don't actually get teleported.
Before I sent this I even had tested both my gamespy login accounts with aeriel: Katahdin, and A Hurricane of Drama, just to see if that was causing the bug but no. On the UD server a drow also on the Ud server couldn't port me. And curiously, i didnt even get the combat log messages or the mage armor visual effect there.