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Event ID: 21171 Source: MicrosoftFirewall

Level
Description
The VPN connection attempt by user <user> from VPN client IP address <IP address> could not be established.
Comments
 
From a newsgroup post: "The solution for me was to open "routing and remote access" and add more WAN Miniport (PPTP) ports under the section Ports. I only had 5 and added 70".

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