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drnetworker
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L2TP/IPsec connection OK from iOS but not working from Windows 10

Tue Jan 25, 2022 10:47 pm

Hello all,

I've configured a L2TP/IPsec VPN server on a Mikrotik hAP ac lite, following this video https://youtu.be/Swh9OmJ9l20
I'm able to connect to the VPN server from a iOS or Android device, but not from a Windows 10 PC.

Attached the log register from iOS and the Windows PC from both cases.

I'd appreciate any hint to where the issue could be.

Thanks.

Daniel.
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blue
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Thu Jan 27, 2022 10:32 pm

Hello,

KB5009543 update for Win10 is to blame. On 11. January 2022. Microsoft issued that update. Few days latter they figured out the problem. Uninstall that KB and it will work again.

BR...

https://borncity.com/win/2022/01/12/win ... te-kaputt/
https://docs.microsoft.com/en-us/answer ... ows-u.html
 
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karlisi
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Fri Jan 28, 2022 8:54 am

Don't uninstall that update, it will be installed again. Just install another one to patch exactly this problem
https://www.catalog.update.microsoft.co ... =KB5010793
On some computers this appears under optional updates, if not, download it manually.
 
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karlisi
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Fri Jan 28, 2022 8:56 am

But I doubt that is the problem, error message is different. Perhaps this
viewtopic.php?t=149863
 
lfoerster
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Tue Mar 15, 2022 5:39 pm

Works perfectly fine for ALL clients with this waterproof L2TP setup:
https://administrator.de/contentid/5629 ... nt-1440162

Most L2TP clients support only DH group 2 like Winblows !!! If you set this to a higher DH group Winblows onboard L2TP will fail. iOS supports DH group 14 and will work. Pretty much the same behaviour what you have !!
Windows 10 can be tweaked via Registry or Powershell to support higher cipher suites but this means manual tweaking. So just using the correct DH group and SHA1 as hashing should do the trick instantly ! ;-)
 
fevr
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Tue Mar 15, 2022 5:48 pm

Agree with blue and Karlisi that Microsoft was the cause of L2TP VPN's not working the other month.

Just open Windows Update and pull down all the latest updates - it will most likely fix your problem like it did for me.
 
imrobot
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Re: L2TP/IPsec connection OK from iOS but not working from Windows 10

Tue Nov 08, 2022 11:19 pm

Works perfectly fine for ALL clients with this waterproof L2TP setup:
https://administrator.de/contentid/5629 ... nt-1440162

Most L2TP clients support only DH group 2 like Winblows !!! If you set this to a higher DH group Winblows onboard L2TP will fail. iOS supports DH group 14 and will work. Pretty much the same behaviour what you have !!
Windows 10 can be tweaked via Registry or Powershell to support higher cipher suites but this means manual tweaking. So just using the correct DH group and SHA1 as hashing should do the trick instantly ! ;-)
Hi guys,

Followed this awesome tutorial https://administrator.de/contentid/5629 ... nt-1440162

Was able to connec via iOS device to my local network,
But cant connect dirrectly to router 192.168.88.1 for making changes, page does not load,

Can you please tell what to change so I can connect to Mikrotik webfig over VPN L2TP from iOS?
Last edited by imrobot on Tue Nov 08, 2022 11:21 pm, edited 1 time in total.

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