Can't receive multicast stream

[chubba27]

I have VLC 0.8.1 installed on Fedora Core 3. I can play video locally, and I can stream video to a windows machine running VLC, but I can't open a stream on the Fedora box. I get the following messages:

main debug: creating new input thread
main debug: waiting for thread completion
main debug: `udp://@224.0.15.102:2001' gives access `udp' demux `' path `@224.0.15.102:2001'
main debug: demux2_New: access='udp' demux='' path='@224.0.15.102:2001'
main debug: looking for access_demux module
main debug: probing 0 candidates
main warning: no access_demux module matched "udp"
main debug: access2_New: access='udp' path='@224.0.15.102:2001'
main debug: looking for access2 module
main debug: probing 6 candidates
access_udp debug: opening server=:0 local=224.0.15.102:2001
main debug: net: connecting to ':0@224.0.15.102:2001'
main debug: looking for network module
main debug: probing 2 candidates
ipv4 debug: socket buffer size is 0x36000 instead of 0x80000
ipv4 debug: IP_ADD_MEMBERSHIP multicast request
main debug: using network module "ipv4"
main debug: unlocking module "ipv4"
main debug: using access2 module "access_udp"
main debug: pre buffering
main debug: thread 80272304 (input) created at priority 0 (src/input/input.c:228)
main debug: prebuffering done 0 bytes in 96s - 0 kbytes/s
main error: cannot pre fill buffer
main warning: cannot create a stream_t from access
main debug: unlocking module "access_udp"
main debug: thread 80272304 joined (src/input/input.c:290)

It seems as if VLC is just not seeing the stream. I've used Ethereal to confirm that the stream is being received. Both server and client are on the same gbit switch. I've tried running as both a user and as root. I'm stuck here and any suggestions are much appreciated.

[The DJ]

firewall issues perhaps?
VLC definetly isn't receiving a thing.

It can also be that you have multiple ethernet interfaces, which can confuse the kernel as to what path the multicast traffic should take.