There has been concern that the Nubreaks chat has been banning people from entering it. This is not true, the popup you are receiving is a new security feature of Java platform, which is annoying but Nubreaks cannot do anything about it.

Just answer NO when prompted and you can enter the chatroom.

Also windows may prompt a firewall warning... Answer with allow access.

If you follow those steps you should be fine.

Sorry about any inconvenience this causes.

And if you accidentally choose "Yes" then try clearing you browser cache and cookies. If this does not force the above window to come up then re-install Java. This should for sure make the above window pop back up. When it pops back up and asks be sure to choose "No"