Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
On a Microsoft Windows XP-based computer, you disable the Client for Microsoft Networks option for a dial-up connection to prevent access to shared resources. However, after you do this, the dial-up connection is still active. You can access shared resources even after you disable the Client for Microsoft Networks option.
To resolve this issue, prevent access to the shared resources through the dial-up connection. To do this, use one of the following methods.
Method 1: Use Windows Firewall
You can use Windows Firewall to block port numbers 139 and 145. This method prevents data packets from passing through these ports. For more information about how to use Windows Firewall to block ports, click the following article number to view the article in the Microsoft Knowledge Base:
875357 Troubleshooting Windows Firewall settings in Windows XP Service Pack 2
Method 2: Configure the Windows registry after you disable NetBIOS over TCP/IP
How to disable NetBIOS over TCP/IP
Click Start, click Run, type ncpa.cpl, and then click OK.
In the Network Connections window, right-click the dial-up connection that you want to modify, and then click Properties.
In the This connection uses the following items list, click Internet Protocol (TCP/IP), and then click Properties.
In the Internet Protocol (TCP/IP) Properties dialog box, click Advanced.
In the Advanced TCP/IP Settings dialog box, click the WINS tab.
Under NetBIOS setting, click Disable NetBIOS over TCP/IP, and then click OK.
Click OK to close the Internet Protocol (TCP/IP) Properties dialog box.
Click Close to close the dial-up connection properties dialog box.
How to configure registry settings
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey: