Fix VPN Error 691 on Windows 11/10

A Realistic Private Network (VPN) is an important online tool that helps in enhancing your online privacy and certificate. Although VPN tools are great, information technology comes with its own set of problems which can cause lost VPN connections and error messages. Several users reported Connection failed with VPN Error 691. This can be a hindrance when you want to economic consumption a VPN, luckily there are few ways in which you can independently solve this issue.

The remote connection was denied because the user name and watchword combination you provided is not recognized, OR the selected hallmark communications protocol you selected is not permitted on the unaccessible entree server.

The VPN Error 691 is a Dial-Skyward error that occurs even when the connection you have is not a Dial-Skyward. This computer error can go on when the settings aren't correct on the client or the waiter twist and it cannot confirm the authenticity of the connection. The most common cause of Error 691 is an incorrect username OR password. Sometimes it may besides occur when you are using a Public VPN and attempting to login to the VPN with a domain that isn't allowed, or domains are non allowed at all, or the security protocols required mismatch.

Normally, VPN mistake 691 occurs when on that point are problems with network communications protocol settings, remote entree permit issues, firewall blocks, connectivity issues, etc. The most prominent causes can be clubbed as below:

1. Incorrect Username and Password
2. Incorrect connection security settings
3. Problems with Networking settings

Fix VPN Error 691 on Windows 11/10

Here are a few options that testament assistance you troubleshoot VPN error 691

1. Verify the logon Idaho and countersign are correct
2. Use Microsoft CHAP Version 2
3. Uncheck 'Let in Windows logon domain' option
4. Check connectedness's security settings
5. Change the LANMAN parameters.

Let's look at these options in detail:

1] Verify the logon ID and watchword are correct

This might sound like a basic fix but works in most of the cases. Sometimes a VPN Connection failed with error 691 message appears when your username or word isn't correct. To guarantee that your watchword is correct, we advise you to use the Show Password option and also check if you mistakenly have CAPS Engage option turned on.

2] Use Microsoft CHAP Interpretation 2

Sometimes, to localization error 691 you may need to use Microsoft CHAP Version 2; since VPN uses different protocols.  You can use it by following these stairs:

1] Press 'Win Key + X' to open the Windows Menu

2] Select 'Meshwork Connections'

3] Erstwhile the windowpane opens, identify your 'VPN connection', 'right field-click' and select 'Properties' from the menu

4] Click on the 'Security' tab

5] Select 'Allow these protocols' and check 'Microsoft CHAP Interlingual rendition 2 (Magnolia State-Gent v2)'

6] Save changes by hitting 'Fine'

After permitting Microsoft CHAP Adaptation 2, check if VPN Error 691 still appears.

3] Uncheck 'Include Windows logon arena' choice

This fix works if your VPN connection isn't designed properly. Here you will need to incapacitate the 'Include Windows logon domain' in your network connection properties. To fix the issue, follow the infra steps:

1] Pressure 'Acquire Key + X' to open the Windows Menu

2] Select 'Network Connections'

3] In 'Network Connections' locate your VPN connectedness, right-sink in it and choose 'Properties'

4] Fall into place the 'Options' lozenge and uncheck 'Let in Windows logon domain' option

5] Bring through changes by clicking 'Ok'

4] Check connection's security settings

The VPN Error 691 can appear if your connections surety settings are not organized properly. To fix this issue, follow these steps:

1] Press 'Win Key + X' to open the Windows Computer menu

2] Select 'Network Connections'

3] In 'Network Connections' locate your VPN joining, right-dawn it and select 'Properties'

4] Navigate to the 'Protection' tab and check that the Typical (advisable settings) options are selected

5] In 'Corroborate my identity As follows' plane section ensure the 'Allow unsecured password' option is selected

6] Click on the 'Options' tab and uncheck 'Include Windows logon domain' alternative

7] To save changes click 'Ok'

Now check if the job is resolved.

5] Change the LANMAN parameters

Galore users confirmed, changing LANMAN parameters helped in fixing fault 691. This is fairly simple, come after these steps:

1] Hold the 'Win Key' and press 'R'

2] In the Run around Dialog, type 'gpedit.msc' and click 'OK'; this will start the Local Group Policy Editor

3] In the leftover pane, follow this path – Computer Configuration > Windows Settings > Security department Settings > Local Policies > Security Options

4] In the right pane locate and double tick 'Web security measur: LAN Manager assay-mark story'

5] Click 'Local Security measures Settings' tab and select 'Send Lumen &A; NTLM responses' from the drop-toss off fare

6] To save changes 'OK' and 'Utilize'

7] Now, ambiguous-click 'Network Security: Minimum Session Security measures for NTLM SSP'

8] Disenable 'Expect 128-morsel encryption' and enable 'Require NTLMv2 session security' alternative

9] Click 'Utilize' and 'OK' and save these changes

Now, restart your PC to utilise these changes and check if the bring out is fixed.

Having some VPN error pop up and constraining you in conjunctive to the internet can personify exceedingly preventative. If VPN error 691 has been infuriating you, we recommend you try few of our solutions.

Fix VPN Error 691 on Windows 11/10

Source: https://www.thewindowsclub.com/vpn-error-691-on-windows

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