Shoutcast Server error

[spikeboard]

hi
first of al im sorry if i post a question thats already there (then i just couldnt find it

second, i have a litle problem and i dont know how to fix this
the folowing code appears in my log of the server

[yp_add] yp.shoutcast.com gave extended error (Cannot see your station/computer (IP: 217.120.255.25:8000) from the Internet, disable Internet Sharing/NAT/firewall/ISP cache (Connection timed out))

i know that its something to do whit our homenetwork
im the last link of our COAX network (yes i know old but it works / well almost )

if some had the same problem and knows how to fix it..
[whitout changing my hardware (like i must have the MAIN connection)its not going to work because my dad wants to be the SERVER so im the last link]
pls help me out

already tnx and greetz
spike

ps. im dutch so dont type to difficult words