Windows 10: Windows 10 VPN authefication problem, CHAPv2 is on

  1.    08 Feb 2016 #1

    Windows 10 VPN authefication problem, CHAPv2 is on

    Hi win 10 gurus, I think you all heard about Windows 10 authentication problems with VPN. The only solution which works for at least 2-3 people, which I found in the Internet was to check that MS-CHAP is on in properties of my VPN connection. I checked and it is on, I also tried to check every sort of variations of CHAP/no CHAP and strength of security encryption. Nothing works. In my case there is one interesting details, it worked fine in windows 8.1 and Windows 10 which was installed on W8.1 via upgrade. Then I installed W7, VPN worked there but W7 have some issues with routing of http requests when VPN is on, so I decided to go back to W10. To my big and very unpleasant surprise I found that W10 can't connect to VPN which previously worked fine. It says classical: "The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server"

    Does anyone here have any actual working solution for this problem besides checking MS-CHAPv2? Some people say it is caused by wrong format of how W10 sends authentication data, but I can't understand how it worked for a couple of months ago, until I decided to reinstall system...
      My ComputerSystem Spec

  2. bro67's Avatar
    Posts : 4,923
    Mac OS High Sierra 10.13.5
       09 Feb 2016 #2

    Looks like it has been known since 2012 that MS-CHAPv2 has been a huge security risk and they finally shut the problem down with Windows 10, by removing that feature. Microsoft Security Advisory 2743314 You can go through all of the other Security advisories if you wish. Security Advisories and Bulletins

    It all depends on how the VPN server is set up. The Software Engineers have royally screwed up the networking part of Windows 10 in the latest rollout. You are the first one to mention this about VPN being an issue.

    I just did a quick search. Oh, it is a major PITA that goes back to November. I do love the Microsoft employee's reply to someone on Microsoft's Social.technet board. It is about as canned of a response as you can get. "Thank you for your question.

    By this issue, we could refer to the following steps to troubleshoot:

    1.Use the build-in VPN to check if it work
    2.Then please configure the software in compatibility mode to check if it could be run
    3.Contact the vendor to check Aventail could be run on the build 10596
    4.Rebuild Windows profile or do a clean boot to check if the issue persist

    Best Regard,"

    Their last reply was to contact the manufacturer of the Firewall/VPN Appliance, because it is typical Microsoft kicking the can down the road.
      My ComputerSystem Spec


Related Threads
Solved Is this a Windows 10 Problem? in General Support
Hi, I am having an issue with reports that are created in Crystal Reports in an application that was built in Visual Studio. My operating system is Windows 10 Professional, with all of the updates applied. My copy of Visual Studio is...
Password problem or Windows Live Account problem in User Accounts and Family Safety
Cannot remember password, OR typed it in wrong on both entries. When I use the tool for recovering/resetting the password. The system takes me to a reset function, where I am able to put in a new password twice, but the screen that follows does not...
Hi I was using my computer with a HD TV, and I disabled the monitor in the settings. Now I have upgraded my TV to a uhd but it says there is no signal. If I unplugged the TV from the computer I can get the monitor back, but I can't set the...
Windows 10 app problem in Installation and Upgrade
My computer has Windows 7 Home Premium installed with Service Pack 1 and has just been updated but Microsoft says I have to have Windows 7 Home Premium with Service Pack 1 to get the app. How do I get my free upgrade to Windows 10?
Windows 10 problem ! in General Support
Hello my friends. I'm facing a little issue with windows 10! When I start my computer everything seems to be ok, however 30 minutes later the process ntoskrnl.exe begin to use lot of memory. There is a screenshot: 27977 Tanks for your time !
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 21:51.
Find Us