At the moment, there's isn't a password on the server. I removed it last night.
If there ever is a password on the server it's because I've just installed something new and am testing it.
If there's a password on the server and I'm not in the server, expect it to go down at ANY MOMENT WITHOUT WARNING... I'm usually installing something.
So, to answer your question, the password will usually be "testing"... but expect sudden restarts if a password is required.
Have fun.