Plutonium

Everytime I try to connect to one server, the cmd window jumps out and makes a series of "dot" sounds(just like Morse code). It seems that I'm connecting to this server but in the end I stuck in the cmd window. I wonder if i was banned from the server because I played in it several hours ago. Is it just a network problem？I can still join other servers. Any suggestions would be greatly appreciated. Ingore my poor English.