Jun 17, 2011

Troubleshooting Remote Access VPNs I

 Cannot Establish a Remote Access VPN Connection


·         Cause: The name of the client computer is the same as the name of another computer on the network. 

Solution: Verify that the names of all computers on the network and computers connecting to the network are using unique computer names.

 Cause: The Routing and Remote Access service is not started on the VPN server. 

Solution: Verify the state of the Routing and Remote Access service on the VPN server.
 Cause: Remote access is not turned on on the VPN server. 

Solution: Turn on remote access on the VPN server.
 Cause: PPTP or L2TP ports are not turned on for inbound remote access requests. 

Solution: Turn on PPTP or L2TP ports, or both, for inbound remote access requests.
 Cause: The LAN protocols used by the VPN clients are not turned on for remote access on the VPN server. 

Solution: Turn on the LAN protocols used by the VPN clients for remote access on the VPN server.
Cause: All of the PPTP or L2TP ports on the VPN server are already being used by currently connected remote access clients or demand-dial routers. 

Solution:
 Verify that all of the PPTP or L2TP ports on the VPN server are already being used. To do so, click Ports in Routing and Remote Access. If the number of PPTP or L2TP ports permitted is not high enough, change the number of PPTP or L2TP ports to permit more concurrent connections.

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