I am trying to setup PlexConnect on my Ubuntu 12.10 server. It creates a virtual DNS Server which is configured to run on Port 53. However it throws the error:
DNSServer: Failed to create socket on UDP port 53

Which indicates that the Port is in use. However, I do not see it running:
netstat -anlp | grep -w LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 26979/apache2
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 565/vsftpd
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN 682/inetd
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 538/sshd
tcp 0 0 0.0.0.0:445 0.0.0.0:* LISTEN 564/smbd
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2505/mysqld
tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN 564/smbd
tcp6 0 0 :::443 :::* LISTEN 538/sshd
tcp6 0 0 :::445 :::* LISTEN 564/smbd
tcp6 0 0 :::139 :::* LISTEN 564/smbd

I am by no means a Linux expert, am I missing something? Is there another reason that I cannot assign the program to listen on 53?