Forum: Bryce


Subject: OT but uber important: port mapping for winXP ics

draculaz opened this issue on Sep 12, 2004 ยท 6 posts


judyk posted Mon, 13 September 2004 at 1:36 PM

We have 4 machines sharing an internet connection via ICS (going throug a hub). There are 2 W2K clients and 1 XP client using a broadband connection on a W2K ICS server. Don't know if this is anything like your setup, but we have had very little trouble with it EXCEPT when we have to update the firewall (ZoneAlarm Pro in our case): this seems a very common cause of grief with ICS. If you can access the internet from your server (the one with the broadband connection) but not at all from your client(s), check your firewall to ensure it is not preventing outgoing connections to any of your ISP's servers (DNS servers in particular). You can use reverse IP lookup to identify IP addresses it's blocking, if it doesn't give you that info. Some ISPs can also alter something in your TCP setup called an MTU setting, which can make it difficult for you to browse certain sites. If your client(s) can see some sites but not others, it could be this. There are some fixes around on the internet for this, but they involve updating the registry. Also, if you happen to use VPN, this will shut off your client's ICS access.