||unity-dev|| Somehow can't have over 50 users in a room?

Hi,

I'm running into a problem where I can't seem to get more than 50 users into
a room. When the 51st user tries to join, he gets the LOGIN_FAILED code in
his onJoin() event handler.

Here's an excerpt from the unity log:

2008-01-19 16:01:56,991 INFO    - Client 52 connected to the server from ip
67.202.42.150.
2008-01-19 16:01:57,185 WARN    - CUSTOM Room 5555_49246 was created with
type xyz
2008-01-19 16:01:57,364 INFO    - 52 is being removed: 4

This is repeated for each user that is rejected. Can you tell me what the
code '4' means?

Thanks,
David R