To use Netty you need to setup a netty-mcserver.pd patch on a public IP with a specific port offset (default 10000). The default IP is localhost, so you'd need to enter one to point to your server otherwise audio will go nowhere.
Please go through the readmes inside the src and src/lib dirs to get some help, and check Miller's site for reference: http://msp.ucsd.edu/tools/quacktrip/
Any issues, let me know