You receive an error message when you use a third-party VPN program on a computer that has Windows Live OneCare installed (913737)

RESOLUTION

Important These steps may increase your security risk. These steps may also make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommend the process that this article describes to enable programs to operate as they are designed to, or to implement specific program capabilities. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this process in your particular environment. If you choose to implement this process, take any appropriate additional steps to help protect your system. We recommend that you use this process only if you really require this process.

To resolve this problem, enable the required protocol in the Windows OneCare Firewall. To do this, follow these steps:

1. Open Windows Live OneCare.
2. In the left pane of the Windows Live OneCaremain window, click View or change settings under Other Tasks.
3. Click the Firewall tab.
4. Under Other settings, click Advanced Settings.
5. Click the Ports and Protocols tab.
6. Click to select the General Routing Encapsulation (GRE) protocol or the Encapsulating Security Payload (ESP) protocol, depending on which protocol that the VPN program requires.
   
   NoteIf you are not sure which protocol the VPN program requires, contact the manufacturer of the VPN program.
7. Click OK.
8. Restart the VPN program and try to establish a VPN connection.

Note When you have multiple computers that use Internet Connection Sharing, you may have to repeat these steps on each computer in the network. This includes the Internet Connection Sharing host computer.

Warning We recommend that you enable a protocol only if you need it. Enabling all the protocols in Windows Live OneCarecan make your computer more vulnerable and less secure.