The windows implementation of the Apache Portable Runtime library creates a socket pair for internal communications. These are called wakeup pipes and are implemented as TCP sockets on windows. This happens when a module needs to monitor files or sockets.
The 0.0.0.0:49442 udp port is probably the locally assigned ephemeral port of the connection. You can see four of these ports in the netstat output since there are four om_udp instances defined in your configuration. The LocalPort configuration directive in the NXLog EE can be used to specify a fixed port number for this.