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Firewall blocking networked computers from accessing Internet

Posted on 2003-11-18
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Last Modified: 2010-03-19
Greetings

I have successfully networked 2 computers using a crossover cable:

Computer A: Win2k Pro, has internet connection shared using ICS, and ZoneAlarm firewall
Computer B: WinXP Pro

Computers A and B can communicate fine with each other - but when Computer A is running its firewall, computer B has no access to the internet at all.  This, despite the fact that I have explicitly set my local IP range (192.0.0.0-255) as a "trusted zone".  It also doesn't seem to matter which firewall I use; I've also tried McAfee's firewall product, and that also blocks any attempt by Computer B to access the Internet, even when I explicitly grant "Trusted" status to my local network.

But when the firewall is switched off, Computer B has perfect access to the Internet.

Any ideas how I might solve this?

Thanks,
Shaul

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Question by:saulbehr
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by:JFrederick29
ID: 9778837
Are you able to create "Advanced or Expert Rules"?

Try creating a rule in your firewall software to allow your private IP range outbound access on port 80 (or all ports).
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Expert Comment

by:drev001
ID: 9782563
Software firewalls in this kind of setup, IMO are a waste of time. Just buy a cheap router, then both machines are automatically protected by NAT against inbound attacks and you'll have a much more stable connection.
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by:stevenlewis
ID: 9783114
which firewall are you using?
I use Zone alarm, and have no problems with it
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Author Comment

by:saulbehr
ID: 9785190
I was using Zone Alarm, but I've now switched over to McAfee Personal Firewall.  It doesn't seem to make a difference.  I've explicitly put Computer B in my "Trusted Zone", both as an individual station with a specific IP address, as well as in the IP range of my local network, which should allow it full access through my firewall to the internet - but unfortunately this is all to no avail.  There doesn't appear to be any way of specifying exactly which port to grant access on, so I guess I've granted access on all ports.

Any other ideas?
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JFrederick29 earned 250 total points
ID: 9787055
From everything I have read online it appears that Zone Alarm and ICS don't work well together.  I would assume that ICS is probably the source of your problem.  Try using Sygate Personal Firewall (free) to see if it works better with ICS.

http://download.com.com/3000-2092-10049526.html?part=82835%20&subj=dlpage&tag=button
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Author Comment

by:saulbehr
ID: 9788551
I think you might be right about Zone Alarm.  I've just tried again with McAfee, and it's working now.  (Wonder what happened first time??)
Can't vouch for Sygate, not having tried it myself, but for anyone else reading this PAQ, you might want to give it a try.
Thanks JFrederick29
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by:JFrederick29
ID: 9788621
You're welcome, glad to hear its working, thanks for the points.
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