Ubuntu Networking :: 11.04 Fresh Install -- Can't Open Ports

Yesterday I switched from CentOS to Ubuntu, and wanted to install TeamSpeak3 which runs on ports 9987 UDP and 10011 TCP. The TeamSpeak3 worked fine on CentOS before this.

It appears to be running and netstat -an reports:

Code:
udp 0 0 0.0.0.0:9987 0.0.0.0:*
tcp 0 0 0.0.0.0:10011 0.0.0.0:* LISTEN

I believe the only firewall for Ubuntu is "UFW", am I correct? If so, "ufw status" reports:

Code:
Status: inactive

I do have other things running on UDP (Counter Strike Source servers) and people can connect just fine.

When I telnet localhost 10011 I get a response from the TeamSpeak3 server:

Code:
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
TS3

Welcome to the TeamSpeak 3 ServerQuery interface, type "help" for a list of commands and "help <command>" for information on a specific command. However, telnetting from outside just gets no answer, this is what leads me to believe it is a firewall in the way.