Fix VPN Error 691 on Windows 10

VPN Error 691

A Virtual Private Network (VPN) is an important online tool that helps improve your privacy and security online. Although the VPN tools are excellent, they present their own set of problems that can lead to the loss of VPN connections and error messages. Several users reported the failure of the connection with VPN Error 691. This can be an obstacle when you want to use a VPN. Fortunately, there are few ways to solve this problem independently.

The remote connection was rejected because the username / password combination you provided is not recognized or the selected authentication protocol you selected is not supported. not allowed on the remote access server.

The VPN 691 error is a remote access error that occurs even when the connection you have is not a remote connection. This error can occur when the settings are not correct on the client or server device and the authenticity of the connection can not be confirmed. The most common cause of error 691 is an incorrect user name or password. Sometimes this can also happen when you use a public VPN and try to connect to the VPN with an unauthorized domain, that the domains are not allowed at all or that the security protocols do not match.

Normally, the VPN 691 error occurs in case of problems with network protocol settings, remote access authorization issues, firewall blockages, connectivity issues, etc. . The most important causes can be classified as follows:

  1. Incorrect username and password
  2. Incorrect connection security settings
  3. Problems with network settings

VPN 691 Error Correction

Here are some options that will help you to resolve the 691 VPN error problem.

  1. Verify that the login ID and password are correct
  2. Use Microsoft CHAP version 2
  3. Uncheck the option "Include Windows logon domain"
  4. Check the security settings of the connection
  5. Change the LANMAN settings.

Let's look at these options in detail:

Option 1 – Verify that the login ID and password are correct

This may seem like a basic fix but works in most cases. Sometimes a VPN connection failed with the 691 error message when your username or password is not correct. To make sure your password is correct, we recommend using the Show password option and also check if you're wrong CAPS LOCK option enabled.

Option 2 – Use Microsoft CHAP Version 2

Sometimes, to fix the 691 error, you may have to use Microsoft CHAP version 2; since VPN uses different protocols. You can use it by following these steps:

1) Press'Win Key + X'Open the Windows menu

2) Select 'Network connections"

3) Once the window is open, identify yourVPN connection& # 39; & # 39;right click»And select«properties& # 39; Menu

4) Click on the & # 39;security'Tab

5) Select 'Allow these protocols& # 39; and check & # 39;Microsoft CHAP version 2 (MS-CHAP v2)"

6) Save the changes by clicking on "D & # 39; agreement"

After having allowed Microsoft CHAP version 2, check if the VPN 691 error still appears.

Option 3 – Clear the "Include Windows logon domain" option

This hotfix works if your VPN connection is not configured correctly. Here you will have to disable the 'Include the Windows login domain'In the properties of your network connection. To solve the problem, follow the steps below:

1) Press'Win Key + X'Open the Windows menu

2) Select 'Network connections"

3) InNetwork connections"Locate your VPN connection, right-click on it and select"properties"

4) Click the 'buttonThe options"Tab and uncheck"Include the Windows login domain'Option

5) Save the changes by clicking & # 39;D & # 39; accord & # 39;

Option 4 – Check the security settings of the connection

The VPN 691 error may appear if the security settings of your connections are not configured correctly. To resolve this problem, follow these steps:

1) Press'Win Key + X'Open the Windows menu

2) Select 'Network connections"

3) InNetwork connections"Locate your VPN connection, right-click on it and select"properties"

4) Navigate to thesecurity'Tab and check that the Typical (recommended settings) options are selected

5) InValidate my identity as followsSection "ensure the"Allow unsecured passwordThe option is selected

6) Click on the buttonThe options"Tab and uncheck"Include the Windows login domain'Option

7) To save the changes, click on 'D & # 39; agreement"

Now check if the problem is solved.

Option 5 – Change LANMAN Settings

Many users have confirmed that changing the LANMAN settings has helped correct the 691 error. This procedure is quite simple, follow these steps:

1) Hold theWin KeyAnd press'R"

2) in the Run the dialogue, type & # 39;gpedit.msc& # 39; And click & # 39;D & # 39; agreement& # 39 ;; this will start the local Group Policy Editor

3) In the left pane, follow this path – Computer Configuration> Windows Settings> Security Settings> Local Policies> Security Options

4) In the right pane, locate and double-click 'Network Security: LAN Manager Authentication Level"

5) Click on 'Local security settings"And select"Send LM and NTLM responses'From the drop-down menu

6) Save changesD & # 39; agreement& # 39; and & # 39;Apply"

7) Now double click on 'Network Security: Minimum Session Security for NTLM SSP"

8) DisableRequire 128-bit encryptionAnd allowRequire NTLMv2 session security'Option

9) Click on 'Apply& # 39; and & # 39;D & # 39; agreement'And save these changes

Now, restart your PC to apply these changes and check if the problem is resolved.

It can be extremely frustrating to have VPN errors that prevent you from connecting to the Internet. If the VPN 691 error has infuriated you, we recommend that you try some of our solutions.

Leave a Reply