Open TCP port 53 for dns

install/ubuntu/15.10/firewall/ports.conf

@@ -2,6 +2,7 @@ PROTOCOL='TCP' PORT='20'
 PROTOCOL='TCP' PORT='21'
 PROTOCOL='TCP' PORT='22'
 PROTOCOL='TCP' PORT='25'
+PROTOCOL='TCP' PORT='53'
 PROTOCOL='UDP' PORT='53'
 PROTOCOL='TCP' PORT='80'
 PROTOCOL='TCP' PORT='443'