I don't know the answer to the question, but some more info may help those that do ...

Are you trying to login to your own server or a public one ?
If public, do you have the same problem on all servers ?
What version is the server you are trying to login to ... 4.4, 5.0DR2 ?
What date did you last patch your EQ client ?
Have you been able to login to this server before ? If so, have you changed anything since then, patched, etc.


good luck