Upgrade to Windows 10 2004 (VPN L2TP fail autoconnect)

Anonymous
2020-06-02T14:15:49+00:00

Good evening.

After upgrading to Windows 10 2004, the L2TP / IPSEC VPN using MS-CHAPv2 with the option "Automatically use my Windows log-on name and password (and domain, if any) no longer connects automatically. Note that the computer in question is in an AD domain and in the previous version it was working without problems (the connection was established with the Windows credentials.

It turns out that now, in this version, it says that the user or password is wrong and shows the dialog window for entering the password. I put the same one I use for windows login and the connection is established. I wanted this to be done automatically and, if not possible, I would like to understand technically why this is happening.

Thank you.

Ricardo

Windows for home | Windows 10 | Internet and connectivity

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  1. Anonymous
    2020-10-19T03:29:56+00:00

    Hi AyrA.ch, your registry change that you suggest in your Data Protection API post seems to have fixed my VPN issues.  For anyone else interested in trying this then here's the link and the registry edit that seems to have resolved the problem on my PC.

    https://answers.microsoft.com/en-us/windows/forum/windows_10-security/data-protection-api-dpapi-seemingly-broken/3f37f1dc-2e74-4ee1-8de8-84a1923082a6 

    Potential solution:

    1. Open the registry editor
    2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb
    3. Create a DWORD value named "ProtectionPolicy" and set it to 1
    4. Reboot

    UPDATE:

    I spoke to soon.  Although this appears to have improved my VPN experience it has not fully resolved the problem.  Here's hoping the MS update mentioned in other posts fixes all our woes.

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  2. Anonymous
    2020-10-22T08:20:01+00:00

    I solved it by deactivating the "Automatically use my Windows log-on name and password (and domain, if any)" option.

    It seems to work in contrary, re-activating it Windows asks me for the password when I try to connect to the VPN.

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  3. Anonymous
    2020-10-22T11:50:39+00:00

    I tried this a while ago. And again today. Doesn't work for, neither deactivated nor activated.

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  4. Anonymous
    2020-10-22T17:31:07+00:00

    Just updating this post to say that I have solved this issue, but not by doing anything suggested here. My ISP does not give enrollees static ips. They are dynamic and are behind double NAT. It would appear that whatever Microsoft is doing to enable this VPN cannot work under these conditions. 

    I had to upgrade my line to a static ip which will cost me $10/month extra. 

    Shame that Microsoft can't handle this. Not everyone has a static ip.

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  5. Anonymous
    2020-10-22T18:34:16+00:00

    Windows 10 Enterprise version 20H2, Build 19042.572 and the problem STILL persists. Like everyone else reported this worked fine on version 1909 and earlier. I've had to block all feature updates in WSUS until this is resolved. We're currently holding at version 1909.

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