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Old 08-05-2016, 03:16 AM   #3
MichaelDays
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Join Date: Jul 2016
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Having a VPN client’s connection rejected is perhaps the most common VPN problem. Part of the reason this problem is so common is that there are a lot of issues that can cause a connection to be rejected. First of all check to make sure the Routing And Remote Access service is running. You can check this by opening the server’s Control Panel and clicking on the Administrative Tools icon, followed by the Services icon.
Once you've verified that the necessary services are running, try pinging the VPN server by IP address from the VPN client. You should ping by IP address initially so that you can verify that basic TCP/IP connectivity exists. If the ping is successful, then ping the server again, but this time ping by the server’s fully qualified domain name (FQDN) rather than by its address. If this ping fails where the IP address ping succeeded, you have a DNS problem, because the client is unable to resolve the server’s name to an IP address.
If the TCP/IP connection is valid, the next thing to check is the authentication process.
The method for checking the authentication method depending on the operating system.
I usually prefer to use Windows Authentication in VPN environments, but RADIUS is also a popular choice.
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