I have a simple servlet that makes a connection to a jboss 4 instance on another server. The strange thing is, is that before each connection attempt it sends out several UDP packets including some to the broadcast address. Since i have provided the url to the jboss server i.e. jnp://server:1099 and all the relevant ports are open ( 1098, 1099, 4444, 4445 ) I fail to understand why this is happening. The two machines are on different network segments separated by a firewall. I'd like to think that this is just due to some misconfigured network settings but I am at a loss as what they could be.