Privacy and Security

What Does That VPN Error Code Mean?

Have you utilized a Virtual Private Network (VPN) app before, only to discover that it’s not possible to connect or link? When you find the log file, you’ll find error codes registered in there. You’ll want to know what those codes actually stand for in order to find a solution. Setting up VPNs manually is even more seemly to present to you with error codes, the reason being that there’s no company software between you and the unexpressed mechanics of the VPN connection to explain the meanings of those errors for you.

In the error code guideline, we elucidate the most often experienced VPN error codes. We also propose fixes for the issues that these codes indicate

VPN Error Code 0x800704C9

– No SSTP ports available on the server

This error is reasonably rampant and is simple to fix. You need to get access to the Remote Access Server to able to fix this.

  1. Unlock the Routing and Remote Access control panel.
  2. Enlarge the entry for your server.
  3. Drift the pointer on top Ports and click the right mouse button. Choose Properties from the context menu.
  4. Click on Name and choose WAN Miniport (SSTP) then click on Configure.
  5. Find the number in the Maximum Ports field. By default, this should be 128. Enlarge the number that is displayed.
  6. Click Ok in the Port Properties window to lock it.

VPN Error Code 0x80072746

– Connection closed by remote host

This issue associate to HTTPS authentication certificates. Either the VPN server can’t get the certificate, or there is some variety of issue with it.

You can’t find a solution to this issue by yourself. It’s a problem that is the duty of the own and those who run the VPN server. If you’re utilizing a subscription VPN service, all of the company’s other customers will also be closed out. The VPN’s technicians or mechanics will thus far aware about the issue.

If the certificate is installed, then the server manager requires confirming the HTTPS binding.

VPN Error Code 51

– Unable to communicate with the VPN subsystem

This error code is originated from the Cisco VPN system. It associates with the VPN client, which is the VPN software operating on your computer. The VPN software can’t get through to the unexpressed network software on your PC to achieve a connection or link. This means something has stalled. The VPN can be closed down and run network diagnostics. Set up the VPN up again and see if the issue has been solved or correct.

VPN Error Code 412

– The remote peer is no longer responding

This is a Cisco VPN error code that originated from the VPN client software. This is extremely indistinguishable from error 51. Nevertheless, as a result of this, the client program was connecting with the VPN server, but lost the connection. Close down the VPN, run network diagnostics, make sure your internet link is working, then switch the VPN on again.

VPN Error Code 609

– A device type was specified that does not exist

This error code is originated by the VPN software on your PC. What this means that the VPN will not pass over to a port, the reason is that the device type distinction is not available or is not configured correctly.

You can confirm that the necessitate device type is available on the PC by opening or unlocking a Command Prompt window and imput netcfg.exe -q < miniport name > where the miniport name is one of the listed below (according to VPN protocol):


L2TP:     MS_L2TP



This distinction should start with your VPN and networking software. The simplest method to fix the issue is to restart everything. Nevertheless, make sure you first of all try the diagnostics system to see whether that can that can provide a solution to fix the issue.

  1. View at the error report message and then click on Diagnostics. Follow by click on Repair.
  2. End the Remote Access Connection Manager (rasman) service and then switch it back on.
  3. Switch off the VPN, close everything down, reboot or restart your PC, then switch the VPN on again.

VPN Error Code 619

– A connection to the remote computer could not be established

This error is often appearing on the Windows computers. It is commonly due to the firewall blocking gateway to the network. This is not the only potential cause of the error, nevertheless, so you may want to try various possible solutions as well so that to make the VPN functioning.

First of all, confirm that you only have one VPN running or functioning.

Click on the top arrow in the service tray of your taskbar to find the unseen icons of functioning programs. Right click on all icons of VPNs and choose Quit from the context menu in each case to off it.

  1. Right click on the taskbar at the down or bottom of your desktop and choose Task Manager from the context menu. Scroll down to the list of active processes and shut down the entire associate to the VPNs that you’ve installed.
  2. Reboot your favorite VPN to see if the issue has been fixed.
  3. If this doesn’t resolve the issue, you will need to shut down your firewall to test if that was causing the issue. If you have Windows Firewall, follow these step by step:
  4. Click on the Windows button to activate the Start menu, and then click on the cog symbol to have access to the Settings system.
  5. Enter Windows Firewall into the search box in the Windows Settings screen. Click on Windows Firewall in the list of results displayed.
  6. Click on Turn Windows Firewall on or off in the left-hand menu of the Windows Firewall window.
  7. Click on the Turn off Windows Firewall radio button in both the Private network settings and Public network settings.
  8. Click on OK to save the settings, and then try the VPN again.

If this tests proving that the firewall was blocking your VPN connection, contact the help desk of your VPN provider to get a solution to the problem.

VPN Error Code 633

– The modem (or other connecting device) is already in use or is not configured properly

This issue emanates when the Transmission Control Protocol (TCP) port that the VPN connection needs is thus far being utilized by another program. This could be that the other program impeded, or fell above without accomplishing the measure release methods needed to make the TCP port accessible to other processes or method. The solution to this issue is extremely indistinguishable from the steps for correcting error 609. The diagnostics repair won’t be able to support you, but rebooting the Remote Access Manager should clear out all block ports. If a rogue method won’t die, reboot your computer to clear out the dead wood.

VPN Error Code 645

– There was an internal authentication error

This error can occur as a result of olden, outdated versions of Windows. You’re more probably to see error code 691 on the newer versions of the operating system (you can see below). The error occurs when the VPN server refuses or denies a connection as result of you entered username and password wrongly.

VPN Error Code 691

– Access denied because username and/or password is invalid on the domain

This issue should be very simple to repair. It is caused when your username or password wrongly. Ensure that Caps Lock is put off, because these credentials are case sensitive. Make sure that the username and password that the network administrator or the VPN Company provided are correct by rechecking back with them to confirm. At this junction, the administrator should also inspect that your account has really been generated on the VPN server.

VPN Error Code 720

– A connection to the remote computer could not be established

This issue occurs on Windows computers where you’ve manually set up a VPN definition. The most likely reason for the error is that you entered the incorrect protocol in the VPN Type field. Try setting the type to Automatic and then retest the connection or link.If that doesn’t resolve the problem or the issue, read through the VPN’s online documentation to access the right protocol for the server that you want to link to. If all these don’t still work, ask the VPN Company’s help desk or support.

VPN Error Code 721

– The remote computer did not respond

This is Windows errors that occur as a result of a failure of the VPN client software functioning on your computer to get through to the unexpressed networking software. Close down the VPN, run network diagnostics, make sure your internet connection is working, then turn the VPN on again.

VPN Error Code 732

– Your computer and the remote computer could not agree on PPP control protocols

This Windows error could occur either on your computer or on the VPN server. This is an issue that occurs when your user account doesn’t have the right access to VPN resources. The issue could associate to the user account permissions on your computer, the access permissions to the network (if you’re linking through a company or university network), or on the VPN server.

The most likely location for the source of this error, if you are a private VPN user of a subscription service, is on the VPN server. As such, you’ll need to contact the VPN’s help desk or support to fix or repair this error.

VPN Error Code 734

This is a difference on error code 732. It occurs when a connection was established, but then rejected for some reason associate to resource access rights. Contact your VPN provider’s help desk to resolve this issue.

VPN Error Code 766

– A certificate could not be found

This error occurs on connections with the Layer 2 Tunneling Protocol (L2TP) over Internet Protocol Security (IPSec). The connection needs the presence of an authentication certificate on the client and on the VPN server. One of those certificates was not available for this connection, thus producing an error. Your VPN provider should be able to find a solution to this error.

VPN Error Code 789

– The security layer encountered a processing error during initial negotiations with the remote computer

This is a general error involve IPSec connection parlaying for L2TP. This is another error code that could associate to the not present of security certificates, or inconsistencies between the identity of either the client or the server and the details given on their respective certificates. If the system is using Pre Shared Keys (PSK) ensure that both the client and the server have the exact key.

VPN Error Code 800

– Unable to establish the VPN connection because a tunnel could not be set up

This is a catch-all error code that doesn’t give any information on what issue arose. You are more probably to have this error code, rather than one giving more exact information of the issue, if you have the VPN type set to Automatic. If you know the VPN protocol that you should be using to connect to a specific server, go back to the VPN setup in the Windows Network Settings and change the type of the VPN from Automatic to the same protocol. Save these new settings and try again, hoping for a more exact error code.

If defining the VPN type more exactly doesn’t get you a good description of the connection error, you’ll have to confirm through all of the VPN’s settings.

Make sure you have the right server name.

Ask the VPN Company for the IP address of the server and enter that instead of a name.

Check your username and password.

If the settings all seem fine, then work through the following steps to see if any of them solves the problem.

  1. Switch off your firewall.
  2. Reset your router.
  3. Close down the VPN and start it up again.
  4. Stop the Remote Access Connection Manager (rasman) service and then switch it back on.
  5. Switch off the VPN, shut everything down, restart your computer, and then switch the VPN on again.

VPN Error Code 806

– The VPN connection between your computer and the VPN server could not be completed

In this example, a connection was created for the VPN server, but the normal procedure of data exchange cannot proceed. The reason is that a network firewall somewhere along the route is blocking VPN traffic, which Utilizes the Generic Routing Encapsulation Protocol. You will have to contact your Internet Service Provider (ISP) and ask it to fix this issue. The most likely source of the issue is on TCP port 1723, which must be opened.

VPN Error Code 809

– The network connection between your computer and the VPN server could not be established because the remote server is not responding

This is a similar issue to error 806. It’s caused by a firewall or router along the journey blocking access to TCP 1723. Contact your ISP to solve this issue.

VPN Error Code 812

– The connection was prevented because of a policy configured on your RAS/VPN server

This is a difference between error codes 732 and 734. The issue is caused by your user account has insufficient privileges on the VPN server to successfully make a connection. You will require to contact your VPN’s help desk and get them to fix this error.

VPN Error Code 868

– The remote connection was not made because the name of the remote access server did not resolve

If you’re fortunate, this problem was caused because you spelled the name of the server incorrect when you setup the VPN. Contact the help desk and confirm the name of the server that you should be connecting to. Then ask them to give you the server’s IP address. This problem could have been caused by an incorrect entry in the Domain Name System (DNS), which interprets host names into IP addresses. Replacing the server name with the real IP address is the fastest way to solve these problems.

Check the name of the server in the VPN connection setup. If you had the right name, replace the name of the server with the IP address, and really make sure you’ve entered your username and password rightly and try the VPN connection again.

VPN Error Code 13801

– IKE authentication credentials are unacceptable

This Internet Key Exchange version 2 (IKEv2) errors is all about the problems with the server’s authentication certificate. As you have no power over the server, there is little you can do to fix this problem. You will have to contact the VPN provider’s help desk and get them to repair the error.


Having to deal with a string of errors when you try to connect to a VPN can be really frustrating. Cheap quality VPN services have poor customer support and it can take days to get a response from it. If a VPN company has a very slow help desk, their support operators possibly won’t be very skilled either, so the first response to your support ticket may be an obtuse reply that entirely misses the point. low support teams love to flag issues and resolved as quickly as possible. They constantly misunderstand the problem intentionally so they can get you off their row and keep their response ratings up.

A large number of error codes for VPNs shows you that many things can go incorrect when you try to set up a VPN manually. It is far better to look for a good VPN service that involves a self-installing application. VPN applications rarely go wrong, especially if the installation went without a hitch. Make sure you choose a good VPN service with a highly rated customer support team. Then, optimistically, you’ll never have to face the challenge of reading a VPN error code on your screen.


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