How to fix error error-ipsec-mm-auth-not-found in Windows 11

Solution Steps

1. 1 Press Windows key + R, type "secpol.msc" and press Enter. This opens the Local Security Policy editor.
2. 2 Navigate to "IPsec Policies on Local Computer" in the left pane.
3. 3 Right-click on the policy that is causing the error and select "Properties". Go to the "Security Rules" tab.
4. 4 Examine each security rule and look for any that reference an authentication method that might be missing. If you find a rule with a broken reference, you can either edit the rule to use a valid authentication method or remove the rule.
5. 5 To edit, select the rule and click "Edit". In the wizard, go to the "Authentication Methods" section and choose a method that exists (e.g., Kerberos, certificate, or preshared key).
6. 6 If you don't need the rule, select it and click "Remove".
7. 7 After fixing, click OK and run "gpupdate /force" in an admin command prompt to apply changes.