There has been a couple of bugs in Java in the past that have caused minor problems but none that prevented a connection. And it works well with the latest version.
I use IE 7, Firefox 2.x, Opera 9.x and Konqueror 3.x. All work well for the chat room.
You must allow pop ups from beesource. You must allow the Java Script to run. If you have a browser or addons that are blocking it, you will not get in.
There are many types of software and hardware firewalls and all I can offer easily is that you will be connecting over TCP port 8003. I will say that the Windows firewall or a simple off the shelf router will not typically cause you any problems.
If you've installed a software firewall or own router and understand how they work, my giving you the port number will mean something to you. If it doesn't, you are going to have problems. I'm not going to try and start a class on firewalling 101. That would take a forum all of it's own.
If you're not having firewall problems (you don't own one) and your ISP isn't providing one (most don't) and you are having problems getting in. You should be very specific in your explanation of the errors and responses you get when you try to connect to the chat room and leave a message in the chat room forum or send me a PM. Either place you put the message I will see it in my email and I'll get back with you ASAP. I'll try to give you some assistance in getting in. I haven't been in the chat room much lately or on the forums, the bees are kinda working me to death now, but I do get my email and will be happy to take a break and hopefully lend a hand.
"Success is not final, failure is not fatal: it is the courage to continue that counts." Winston Churchill