Troubleshooting networks: Can vendor software self-install firewalls?

Troubleshooting networks: Can vendor software self-install firewalls?

I installed a wireless modem/router: 2Wire. Everything is fine except my users share folders on Computer A. Computer A can successfully ping Computer B, but when Computer B tries to ping Computer A it is not successful.

Computer A has a Windows firewall and B does not. I disabled A's Windows firewall and still B could not ping A. Is it possible that the Norton software (s/w) has installed its own firewall? How do I determine if there's another firewall besides Windows Firewall?

Can you think of any other reasons why, suddenly, after I installed a new modem/router, that previously shared document folders on Computer A cannot be accessed by Computer B?

    Requires Free Membership to View

    Login

    By submitting your registration information to SearchNetworking.com you agree to receive email communications from TechTarget and TechTarget partners. We encourage you to read our Privacy Policy which contains important disclosures about how we collect and use your registration and other information. If you reside outside of the United States, by submitting this registration information you consent to having your personal data transferred to and processed in the United States. Your use of SearchNetworking.com is governed by our Terms of Use. You may contact us at webmaster@TechTarget.com.

There could be a number of issues going on here. It could be a Windows networking problem, a configuration issue, or a firewall issue.

Let's start with Windows issues. One good article that might help is on Microsoft's support page: How to troubleshoot network in Windows XP. You will also want to check your TCP/IP settings to make sure IP, netmask, and default gateways are all correct.

If those are correct, check to see if you can you ping by IP and/or computer name. Also, check to see of you can see the other computer in Network Neighborhood. If everything looks right here, check the firewall settings.

This was first published in February 2009