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Window 7 VPN error 800 with Event ID 20209 and 20277

When creating PPTP on the Windows 7, it shows IKEv2

Symptoms: When trying establishing the VPN from Windows 7 to a windows 2008 VPN server, the client receives Connection failed with error 800. The Windows 2008 server log the following event;

Source: RasMan

Event ID: 20209

Description:

A connection between the VPN server and the VPN client 24.x.x.x has been established, but the VPN connection cannot be completed. The most common cause for this is that a firewall or router between the VPN server and the VPN client is not configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47).

In the VPN client, the following event is logged;
Source: RasClient
Event ID: 20227
Description:
CoId={05285DAD-4E4A-4190-AD8A-41B04DB7E157}: The user windows7\blin dialed a connection named VPN1 which has failed. The error code returned on failure is 0.

 

Troubleshooting: 1. Try another Windows 7 computer. it works fine.

2. Verify the GRE is open.

3. In the Network connections, we find the VPN shows WAN Miniport (IKEv2) instead of PPTP.

4. After changing IKEv2 to PPTP, we still get the same error.

 

 

5. Delete the VPN and re-create doesn't make any different.

6. After checking all connection settings, we find the notebook is setup as ICS which conflicts with VPN. disable ICS fixes the problem.

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