Hi, When I start JBoss (Version 4.0) I start getting following errors 46,712 ERROR [UDP] exception=java.net.SocketException: Invalid argument: Datagram send failed, msg=[dst: 228.1.2.3:45566, src: MYSERVER:1221 (additional data: 16 bytes) (2 headers), size = 0 bytes], mcast_addr=228.1.2.3:45566 12:31:57,918 ERROR [UDP] exception=java.net.SocketException: Invalid argument: Datagram send failed, msg=[dst: 230.1.2.7:45577, src: MYSERVER:1245 (2 headers), size = 0 bytes], mcast_addr=230.1.2.7:45577 12:31:58,929 ERROR [UDP] exception=java.net.SocketException: Invalid argument: Datagram send failed, msg=[dst: 228.1.2.3:43333, src: MYSERVER:1226 (2 headers), size = 0 bytes], mcast_addr=228.1.2.3:43333 12:32:08,283 ERROR [UDP] exception=java.net.SocketException: Invalid argument: Datagram send failed, msg=[dst: 228.1.2.3:45566, src: MYSERVER:1221 (additional data: 16 bytes) (2 headers), size = 0 bytes], mcast_addr=228.1.2.3:45566 12:32:11,908 ERROR [UDP] exception=java.net.SocketException: Invalid argument: Datagram send failed, msg=[dst: 230.1.2.7:45577, src: MYSERVER:1245 (2 headers), size = 0 bytes], mcast_addr=230.1.2.7:45577 Your input will be a great help. Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4033438#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...