I have a cable connection shared between 2 computers A (Win XP Pro) and B (Win 2000) thru an Accton Cheetah Access Internet Gateway. I am able to get both computer working with the IP address as 192.168.xxx.3 for PC A and 192.168.xxx.2 for PC B. The gateway IP (the broadband router is 192.168.xxx.1. Now, my problem is, I can't seem to be able to DCC send out anything from mIRC on PC A but I am able to recieve. Also, nobody can access my FTP server at all on PC A also. I have already enabled DMZ host on PC A. I have tried opening all the ports mIRC use already in my router's special application page but still to no avail. I also have enabled DMZ host on the PC i want to use for DCC and FTP server. Also, I can't seem to share files between the 2 PCs even though I have already configured the folders to be "shared". I have tried disabling the built in firewall in WinXP Pro. Everything was working fine when PC A used to have Win 2000 last time, but this problem comes when I recently upgraded to Win XP Pro. So any networking experts out there can help me?