How to Repair: VPN Error 691 in Windows PC

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A virtual private network (VPN) is an encrypted tunnel that protects your privacy online. It’s software that hides your online activities from prying eyes, such as the government or your company’s administrator. In other words: when you connect to the Internet with a VPN, your connection is secure and private, and no one can access your Internet data. VPN software is especially useful if you want to send sensitive information over a public WLAN or keep your browsing history private.

If a VPN performs an important function, problems often arise. Some Windows users have reported receiving a “691” error when trying to connect to a VPN. This error prevents access to the Internet, which can be quite annoying. In today’s Windows tutorial, you will learn how to fix Windows VPN error 691 and what causes this error in the first place.

What causes VPN error 691?

Most often, error 691 occurs when the settings on one of the devices are wrong and you can’t immediately determine the authenticity of the connection. The most common causes are an incorrect username or password, or, if you’re using a public VPN, your access may have been blocked. Sometimes this problem can also occur because of incorrect security protocols.

If you encounter this error, you can fix it using the following simple methods.

How to fix VPN 691 error?

Update your network drivers

1. Go to Search, type devicemngr, and open Device Manager.
2. Expand Network Adapters and find your router.
3. Right-click on your router and go to Update drivers.
4. Follow the instructions on the screen and complete the driver installation.
5. Reboot your computer.

Removing and adding a VPN connection

1. Press the Windows + I keys to open the Settings app.
2. When the Settings app is open, go to the Network and Internet section. Now go to the VPN tab.
3. Under the VPN section, you should see all the available VPN connections.
4. Select the connection you want to delete and click Delete.
5. Now you need to add a new VPN connection. To do this, click the Add VPN Connection button.
6. Then enter the information you need to set up the VPN connection.
7. Once you’ve created your new VPN connection, try connecting to it and see if the problem persists.

Check the security settings of your connection

1. Open the Network Connections window.
2. Find your connection, right-click it, and choose Properties from the menu.
3. Click the Security tab and make sure that Typical (recommended settings) is selected.
4. In the Verify My Identity section as follows, make sure that Allow unsecured passwords is selected.
5. Click the Options tab and make sure the Include Windows login domain option is not selected.
6. Click OK to save your changes.

Using Microsoft CHAP version 2

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

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