Three things come to mind
1: Is kithicor down? (probably not, but worth asking)
2: Can you use a different computer to try to login?
3: Can you move a different (E.G. lv 1 halfling temp alt) character to kithicor successfully?
Edit:
If you can't get anywhere with this, you should put in a /petition in-game or put a new thread into the
petition forum