Event ID 20276 — RAS Connection
Applies To: Windows Server 2008
A server running Routing and Remote Access provides two different types of remote access connectivity: virtual private networking (VPN) and dial-up networking. VPN is the creation of secured, point-to-point connections across a private network or a public network, such as the Internet. A VPN client uses special TCP/IP-based protocols called tunneling protocols to make a virtual call to a virtual port on a VPN server. In dial-up networking, a remote access client makes a nonpermanent, dial-up connection to a physical port on a remote access server by using the service of a telecommunications provider, such as analog phone or ISDN. In contrast to dial-up networking, VPN is always a logical, indirect connection between the VPN client and the VPN server over a public network, such as the Internet.
|Product:||Windows Operating System|
|Message:||CoId=%1: Layer=%2: SubLayer=%3: The connection attempt failed on port: %4 because of the authentication protocol selected. Check to see if the authentication protocol is supported in the operating systems at the client and server ends of the connection|
Correct the mismatch in client and server configuration parameters
Check that the remote access client connection is configured with the same connection parameters as the remote access server. For example, Microsoft Challenge Handshake Authentication Protocol (MS-CHAP) version 1 is not supported in the Windows Vista operating system. MS-CHAP version 2 should be used instead because it provides better security. However, Network Policy Server (NPS) supports and can be configured to use MS-CHAPv1 or MS-CHAPv2. There is a potential mismatch in this case with authentication protocols in the client and server configuration parameters. In this case, on the client computer running Windows Vista, change the authentication protocol configuration parameter from MSCHAPv1 to MSCHAPv2, and attempt to re-establish the connection.
To verify that the remote access server can accept connections, establish a remote access connection from a client computer.
To create a VPN connection:
- Click Start, and then click Control Panel.
- Click Network and Internet, click Network and Sharing Center, and then click Set up a connection or network.
- Click Connect to a workplace, and then click Next.
- Complete the steps in the Connect to a Workplace wizard.
To connect to a remote access server:
- In Network and Sharing Center, click Manage network connections.
- Double-click the VPN connection, and then click Connect.
- Verify that the connection was established successfully.