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Chapter 19. Network Security > Troubleshooting

Troubleshooting

Shared Folders Are Visible to the Internet

When I use Explorer to view my computer across the Internet, I am prompted for a username and password, and/or shared folders are visible.

If you have this problem, Microsoft file sharing services are being exposed to the Internet. If you have a shared connection to the Internet, you need to enable the Internet Connection Firewall, or enable filtering on your Internet connection. At the very least you must block TCP/UDP ports 137 through 139 and 445. Don’t leave this unfixed!


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