Win98SE ICS Problem

Hi,

I have a network at home with 3 computers, 1 has a modem and Win98SE with Internet Connection Sharing (ICS) installed, another Win98, and another Win95.
The whole thing works perfectly, except one hiccup. ICQ on all 3 computers will not receive files... they are running ICQ99a and one has ICQ99b. Even the computer with ICS on it will only receive files if I disable ICS.

Does anyone have any idea as to what would cause it? So far I have tried uninstalling ICS and reinstalling it, to no avail, uninstalling and reinstalling TCP/IP on all the computers, and upgrading ICQ on one of them to see if that made any difference.

Any help would be greatly appreciated!
Derek Bartlett
Sydney Australia :-)