Looks to me like multicast isn't enabled properly. First, check using "ifconfig -a" that multicast is enabled on your network interfaces. eth0 Link encap:Ethernet HWaddr 00:E0:81:51:41:39 inet addr:192.168.0.6 Bcast:192.168.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14003 errors:0 dropped:0 overruns:0 frame:0 TX packets:13294 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:10695433 (10.1 Mb) TX bytes:1728797 (1.6 Mb) Interrupt:16 Base address:0x3000 Memory:c2220000-c2240000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1398 errors:0 dropped:0 overruns:0 frame:0 TX packets:1398 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:174382 (170.2 Kb) TX bytes:174382 (170.2 Kb) Then, do "route -n" and make sure you have something like this line: 224.0.0.0 0.0.0.0 240.0.0.0 U 0 0 0 eth0 If that's missing, you need to add a route. Su to root and do: route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0 Or similar, depending on what name your network device has.