VPN connection failed with error 691 in Windows 10 [FIX]

Milan Stanojevic – deputy editor-in-chief

• The VPN tool built into Windows 10 can be very useful, but a failed connection with a 691 error can spoil your fun.
• While VPNs are great tools for protecting your privacy, they can sometimes fail.
• If your VPN fails, you may be vulnerable to attacks and data breaches.
• See the solutions below to solve this problem, or consider switching to a full premium VPN instead.

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Many people use VPNs to protect their privacy online. VPN tools are a big deal these days, and Windows 10 also supports VPNs natively, so you don’t need any third-party software. Or do you need them?

VPN problems can occur and users reported that the connection did not work with an error message 691. This can be a problem if you want to use a VPN, but there are several ways to solve this problem.

How can I resolve the VPN 691 connection error?

1. install private internet access

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The Windows solution is simple enough to use and meets basic VPN needs, but if you rely heavily on VPN, you should consider switching to a high-end software.

When you connect your PC to the PIA interface, you will definitely benefit from a wide range of features and not have to worry about connection errors. This well-designed VPN will simplify your connection, eliminate server buffering and ISP throttling, and increase download speed.

With unlimited bandwidth and more than 3,292 servers strategically located around the world, PIA lets you choose the server closest to you and route your traffic through highly encrypted VPN tunnels.

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Access to private internet

Forget about connection errors! Get the most out of your Internet experience with over 3292 PIA servers to choose from!

2. Use Microsoft CHAP version 2

VPNs use different protocols. To resolve connection error 691, you must use Microsoft CHAP version 2. Follow these steps to do so:

1. Press the Windows + X key to open the Win + X menu. Select Network Connections from the menu.
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2. When the “Network Connections” window opens, locate your VPN connection, right-click on it and select “Properties” from the menu.
3. Click on the Security tab.
4. Choose Allow these logs and activate Microsoft CHAP version 2 (MS-CHAP v2).
5. Click OK to save your changes.

After activating Microsoft CHAP version 2, check if the problem persists.

3. Disable the “Enable Windows Domain Login” option.

Sometimes error message 691 may appear if your VPN connection is not properly configured, but you can resolve this issue by disabling the Enable Domain for Windows Connection option. Follow the steps below to do this :

1. Open the network connections. For detailed instructions, see the previous solution.
2. Find your VPN connection, right-click on it and select Properties from the menu.
3. Click on the Preferences tab and uncheck the check box Switch to Windows Domain Login.
4. Click OK to save your changes.

Changing LANMAN settings

According to users, this problem can be solved on the computer by simply changing the LANMAN settings. This is relatively simple and you can do it by following the steps below :

1. Press the Windows + R key and type gpedit.msc. Press the Enter key or click OK.
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2. Starting the local group policy editor. In the left pane, go to Computer Configuration > Windows Settings > Security Settings > Local Policy > Security Options.
3. In the right-hand pane, find and double-click Network Security: LAN Manager Authentication Level.
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4. Click on the Local Security Settings tab. Select Send LM & NTLM replies from the list. Click Apply and OK to save your changes.
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5. Now double-click Network Security: Minimum Session Security for NTLM SSP.
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6. Be sure to disable the required 128-bit encryption option and enable the required NTLMv2 session security option. Click Apply and OK to save your changes.
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7. After you have made these changes, restart the computer to apply them.

Make sure your username and password are correct.

Sometimes, if your username or password is incorrect, error message 691 may appear. To make sure your password is correct, make sure you have the CAPS LOCK option enabled.

Also, be sure to enter your email address as your username.

Note: To avoid connection errors when using a VPN, especially 691, we recommend switching to a highly secure VPN such as PIA or Cyberghost.

Wise decision!

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6. Update network drivers.

Now let’s try to update your network drivers. Here’s how:

1. Go to Search, type devicemngr and open Device Manager.
2. Unfold the network adapters and locate your router.
3. Right click on your router and go to “Update Driver”. Error: The file name is not specified.
4. Follow the on-screen instructions and complete the driver installation.
5. Restart your computer.

Automatic driver update

If you do not want to search for drivers yourself, you can use a tool that will do this automatically for you. Of course, since you cannot connect to the Internet at this time, this tool is useless.

Once online, however, you can inform all drivers so that you do not find yourself in this situation.

The Tweakbit driver update program (supported by Microsoft and Norton Antivirus) can help you automatically update drivers and prevent damage to PCs caused by installing incorrect driver versions.

After several tests, our team concluded that this is the best automatic solution.

Here you will find a short manual on how to use the device:

Driver Updater analyzes the installed driver versions with its online database of the latest versions and recommends the appropriate updates. Just wait for the scan to finish.
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• Once the scan is complete, you will get a report of all the problematic drivers found on your computer. Evalaute the list and decide whether to update each driver individually or all at once.

To update one driver at a time, click the Update Driver link next to the driver name. Or simply click the “Update All” button below to automatically install all recommended updates.
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Note: Some drivers require multiple installation steps, so you will need to click “Update” several times until all components are installed.

7. check the security settings of the connection

An error message 691 may appear if the safety parameters are incorrect.

To resolve this issue, check your connection’s security settings by following the steps below:

1. Open the “Network Connections” window.
2. Find your connection, right-click on it and select Properties from the menu.
3. Click on the Security tab and make sure the Typical (recommended settings) option is selected.
4. Under “Verify My Identity,” verify that the “Allow an unsecured password” option is selected.
5. Click the Options tab and make sure the Enable Windows Domain Login option is unchecked. Click OK to save your changes.

After making the necessary changes, check to see if the problem is resolved.

Leave the domain name for the remote connection blank.

Users reported that their VPN works when using the internal network, but an error message 691 appears when trying to connect to the VPN over the Internet.

It’s a strange problem, but the solution seems pretty simple. According to users, they were able to solve the problem by simply leaving the domain name of the remote connection blank.

To solve the problem, just enter your username and password and leave the domain name blank. Click the “Connect” button and everything should work fine.

9. use the resphone command

If you are having trouble connecting to your VPN, you can solve the problem by running the rasphone command. You can run this command by following the steps below :

1. Press the Windows + X key and select command prompt (Admin) from the menu.
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2. When the command line starts, type rasphone -d The name of your VPN connection.
3. Press Enter to execute the command.

10. Check for other active VPN connections.

Error message 691 may appear when there are active connections. To resolve this issue, check for other VPN connections.

If so, disconnect these connections and check if this fixes the problem.

11. check your domain name

Some users have reported that this problem occurs because your domain name is incorrect. According to users, the problem occurs when your domain name uses the format company.local.

To solve the problem, remove .local from the domain name. For example, if your domain name is Company.local, change it to Company and see if this solves the problem.

12. Use a different login name

Sometimes, when the connection identification profile is corrupt, you get a 691 message with a connection error with error. In that case, create a new login ID and try using that instead.

13. change the username

Some users reported that the error message “Connection error with error 691” Failed to establish a connection with error) appeared because of their username. According to them, the username and password are both correct, but the problem persists. If you have the same problem, you can try adding the domain name to your username.

To do this, add @YourDomainName to your username. For example, if your current username is your username, change it to @YourDomainName. After that, try logging into the VPN again.

14. Removing and adding a VPN connection

If you get an error message 691, you can fix it by simply removing the VPN connection and rebuilding it. This is quite simple in Windows 10, and you can do it by following these steps:

1. Press the Windows + I key to open the Settings application.
2. When the Settings application opens, go to Network and Internet. Now click on the VPN tab.
3. In the VPN section, you should see all the VPN connections that are available to you. Select the connection you want to delete and click Delete.
4. You now need to add a new VPN connection. To do this, click the Add VPN Connection button.
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5. Then enter the necessary information to configure the VPN connection.

After you create a new VPN connection, try to connect to it and see if the problem persists.

15. Using PAP instead of LDAP

Users reported that they cannot use the MS-CHAP v2 protocol with the LDAP server configuration. This causes the connection to fail with error message 691.

To avoid this problem, simply set the LDAP server configuration to PAP and the problem will be solved.

16. Adding ports to WAN/virtual server port forwarding.

This error can occur when you try to use the VPN on your network. According to some users, you can solve error 691 by adding ports to the port forwarding of the WAN/virtual server.

If you are not a network administrator, you should contact your network administrator and ask him to make the necessary changes.

17. Contact your supplier

Sometimes error message 691 can be caused by problems with your Internet service provider. Some users reported that the error was caused by their ISP, but after contacting their ISP, the problem was resolved.

A connection error with error message 691 may prevent you from using your VPN. If you are experiencing this problem, we recommend that you try some of our solutions.

Let us know how it worked for you in the comments below.

FAQs: More information on problems with VPN connections

• How can I fix my VPN connection error?

You can try updating your network drivers manually or with a special program. Also, check your connection’s security settings and make sure the “Typical” and “Allow unsecured password” options are enabled. You can also delete and restore your VPN connection or use a premium VPN program such as PIA.

• How can I prevent my VPN from disconnecting?

Make sure that third-party applications, such as firewalls and antivirus programs, are not responsible for disabling your VPN. Also try switching between options, such as server location, network, or VPN protocol, to see if this solves the problem.

• Can’t connect to the Internet through a VPN?

Start by checking your Internet connection. To do this, try accessing the site without a VPN. If the connection is good, try uninstalling and reinstalling the VPN to make sure you have the latest version, adjust the DNS and proxy settings, or change the VPN protocol and server location.

Editor’s note: This article was originally published in February 2017 and was revised and updated in February 2021 to ensure freshness, accuracy and completeness.

Frequently asked questions

How can I correct error 691?

“Error 691. Error message when trying to connect to an Internet Service Provider …

What is the error code for an error message 691?

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