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You as a sysadmin know that for sure – connection errors, invalid username/password messages, security issues, and configuration problems.
The error message “Unable to establish connection” with error code 800 is a common VPN error. It occurs when the VPN client is unable to reach the server. This error is often caused by a problem with the network connection, for example when the network is down or overloaded.
If you are facing VPN error 800, check your network connection. If the connection seems fine, you can also solve the problem by updating your router firmware, and by making sure that the settings of your VPN client are correct.
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Are you facing error code 691 or the error message “Access denied because username and/or password is invalid on the domain” while trying to use your VPN account? Then you have most likely entered a wrong username or password.
To solve the problem, ensure that both your username and password are correct. Also note that to authenticate to your VPN, you need to enter the PPTP password instead of your account password. You can find the PPTP settings in the VPN control panel.
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Error 633 is one of the most common VPN errors. The error code indicates that there is an issue with your connecting VPN device. It is almost always caused by a wrong configuration of the VPN device or by the connection being already in use.
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This error message is common with the Cisco VPN client. It occurs when the network fails and an active VPN connection is suddenly disconnected. It can also be caused by a firewall interfering with the connection.
If you are facing VPN error 412, get rid of the annoying error message by making sure that nothing interferes with the network connection. If you are using a firewall, change the settings to allow your VPN to work properly.
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Another common VPN error is error code 720, or the corresponding message “No PPP control protocols configured”. This error indicates that the client does not have sufficient protocol support to communicate with the server. It is commonly caused by corrupted miniports.
In order to solve the problem, access the Control Panel. Enter the System configurations an open the Device Manager. The Control Panel will now show you all network adapters. To fix the problem, uninstall the miniport client adapters. Then click on the “Scan for hardware changes” button to populate with new miniport adapters.
Another possible solution is to reset your network in the control panel, then reboot your computer and connect the VPN again. If the error message persists, try uninstalling and reinstalling mini ports as described above.
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The error code 809 occurs when the network connection between the VPN server and your computer cannot be established. When the remote server is not responding, try the following quick fix solution to enable the port.
If you are not able to enable the port, try deploying SSTP based VPN tunnel on the VPN server and the VPN client to allow a VPN connection across the network.
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This VPN error occurs with many VPN clients when a firewall or a port configuration prevents the VPN client from connecting to the computer.
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Error 721 is a Microsoft VPN error message indicating that the VPN connection could not be established. Typical error messages are “The computer did not respond” or “Remote PPP peer or computer is not responding”.
This VPN problem usually occurs when your network does not allow PPTP port 1723 or GRE packets. To solve the issue, check your router settings and make sure the required ports are allowed and that the pass-through option is enabled. After changing the settings, try again to establish the VPN connection.
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Error 609 is one of many typical VPN errors on Windows 10. It occurs when a device type that does not exist was specified or when your Windows operating system is corrupted. When dealing with this VPN error, you may also experience crashes and freezes while running applications on your computer.
The error can by caused by a misconfiguration of the connecting VPN device, registry errors, malware, corrupted files, and more.
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Are you facing error code 789 while using a VPN on Windows 10? Then you are most likely dealing with a connection failure caused by your system not being properly set up to connect to the server.
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Error 812 is one of the less common VPN errors. However, if you are one of the few users facing this error, try the following solutions to fix the VPN error 812 on Windows 10.
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This error pops up if one or more devices, for example your firewall or router, are not configured to allow Generic Routing Encapsulation (GRE) protocol packets.
To get rid of error message 806, check the settings of your firewall and antivirus software, or temporarily disable the software or firewall to allow the VPN connection to be established. Another possible solution is to change the port configurations in TCP Port 1723 in Windows 10 to allow the connection.
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PRTG monitors VPN connections and the local network
PRTG measures traffic, load, and the number of users
PRTG identifies connection problems and suspicious traffic
