[server] could not start network

[GreatBunzinni]

I've just installed openttd 1.00 on Kubuntu 10.04 and it appears I can't start a network game. I've also tried out r20098 and the same problem happens. The following messages are written to stdout:

ALSA lib pcm.c:7245:(snd_pcm_recover) underrun occured
dbg: [net] getaddrinfo for hostname "", port 0, address family either IPv4 or IPv6 and socket type udp failed: Address family for hostname not supported
ALSA lib pcm.c:7245:(snd_pcm_recover) underrun occured
ALSA lib pcm.c:7245:(snd_pcm_recover) underrun occured
dbg: [net] [server] could not start network: Could not create listening socket
dbg: [net] getaddrinfo for hostname "", port 0, address family either IPv4 or IPv6 and socket type udp failed: Address family for hostname not supported

So, any tips?

[GreatBunzinni]

It appears that this error is triggered when openttd tries to listen to a port which is already being listened by some other application.