Windows 8 and 8.1 Forums


EAP-TTLS/EAP-MSCHAPv2 doesn't work

  1. #1


    Posts : 3
    Windows 8

    EAP-TTLS/EAP-MSCHAPv2 doesn't work


    Hello,

    Has anyone tried to use EAP-TTLS authentication to connect to a wifi network ? It seems the authentication passes but the supplicant just drops the conversation. I tried to gather some debug information and this is what I see in the svchost_RASCHAP.LOG - but that doesn't show any error/issues !



    [1344] 02-17 23:06:12:832: EapMSChapv2CMakeMessage: Rcvd packet size: 40
    [1344] 02-17 23:06:12:832: ChapMakeMessage,RBuf=062F5FDD
    [1344] 02-17 23:06:12:832: ChapCMakeMessage...
    [1344] 02-17 23:06:12:832: CS_WaitForChallenge
    [1344] 02-17 23:06:12:832: MakeResponseMessage...
    [1344] 02-17 23:06:12:832: Generating Challenge
    [1344] 02-17 23:06:12:832: GetChallenge.
    [1344] 02-17 23:06:12:832: GetChallenge: LsaCallAuthenticationPackage succeeded
    [1344] 02-17 23:06:12:832: GetChallenge.
    [1344] 02-17 23:06:12:832: GetChallenge: LsaCallAuthenticationPackage succeeded
    [1344] 02-17 23:06:12:832: GetChallengeResponse
    [1344] 02-17 23:06:12:832: GetDESChallengeResponse
    [1344] 02-17 23:06:12:832: GetDESChallengeResponse Success
    [1344] 02-17 23:06:12:832: GetMD5ChallengeResponse Success
    [1344] 02-17 23:06:12:832: GetMD5ChallengeResponse Success
    [1344] 02-17 23:06:12:832: GetChallengeResponse Success
    [1344] 02-17 23:06:12:832: GetChallengeResponse=0
    02 44 00 3A 31 F5 F3 CC 8C D4 61 A5 C3 CC 62 D1 |.D.:1.....a...b.|
    47 68 53 6F 1D 00 00 00 00 00 00 00 00 3B FD 32 |GhSo.........;.2|
    C3 B2 4E 23 B7 21 A8 1C F6 84 68 B2 44 7A 20 61 |..N#.!....h.Dz a|
    76 3D CC 7F 4A 00 54 65 73 74 00 00 00 00 00 00 |v=.J.Test......|
    [1344] 02-17 23:06:12:863: EapMSChapv2End
    [1344] 02-17 23:06:12:863: ChapEnd

    Any idea on what could be wrong ?

    Regards,
    Karthik.

      My System SpecsSystem Spec

  2. #2


    Central IL
    Posts : 3,468
    Linux Mint 17.2
    Last edited by broe23; 18 Feb 2015 at 11:47.
      My System SpecsSystem Spec

  3. #3


    Posts : 3
    Windows 8


    Thanks for your reply. In my tests the EAP-TTLS works with inner PAP/CHAP authentication. However, when I use EAP-MSCHAPv2 or MSCHAPv2 as inner methods to EAP-TTLS then it fails. However, other supplicants seem to work with the same server. So wondering what is unique about the Windows8 supplicant. Would appreciate any insights into this protocol behavior. Thanks again!
      My System SpecsSystem Spec

  4. #4


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    I gave you the links that will tell you the whats and whys. Again, this type of authentication is mainly used in Radius or Domain setups. Cisco created the whole EAP procedure for their networks.

    If you took the time to search and read up on it, you would not need others to do your job for you. Suggest you start studying.
      My System SpecsSystem Spec

  5. #5


    Posts : 3
    Windows 8


    Well, I have read and understood the EAP-TTLS protocol as such, as I am working on a TTLS server implementation. I have gotten it work with almost all supplicants that supports it, except Win8, and hence I believe that there is a difference (or a bug) with the way Win8 supplicant behaves, particularly with respect to MSCHAP based inner methods. I really intended to find if someone had faced the issue with any of their TTLS servers, and might give some hints on how to solve it..

    Sorry if I was not clear with my question, that led you think I did not do research on this topic, but I had been researching on this for quite a while now, and couldn't find any inputs in this case. I am stuck as this is too specific (not a generic configuration issue) and internal to the implementation of Win8 supplicant probably.

    Unfortunately the links you have provided did not help as well.

    Do you or anyone know if there is a better alias where I can post this question and possibly hit some developers/people who have code level insights of how the TTLS with Win8 is implemented ?
      My System SpecsSystem Spec

  6. #6


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    Microsoft's Technet is going to be your best resource for this.
      My System SpecsSystem Spec

EAP-TTLS/EAP-MSCHAPv2 doesn't work
Related Threads
Title: My stereo mix doesn't work well My PC: SP 2000-2b49Ca, window8 Audio: Realtek driver: 6.0.1.6837 (installed sept 21 2013) Panel settings: External Mic: ready, level 75+20dB, 3,5mm connector Microphone: ready, level 75+20dB, ATAPI internal connector Stereo mix: default, level 75, no...
Solved Search doesn't work in Performance & Maintenance
My search feature isn't working.:shock: This is the main search that should start with you typing while the metro screen is up. Some time ago it just disappeared. I've tried a couple of things to get it to work, but I can't. Can anyone run me through trouble shooting it? Thanks, Gn13l
ati 4850 CCC doesn't work in Graphic Cards
İ installed Win 8 9200 on my computer but i have problem with CCC i tried all drivers but none of all didn't install ati catalyst Control Center i use hdmi cable and i can not change scale options what shoul i do ?
WindowBlinds doesn't work in Software and Apps
Just in case anyone is curious, WindowsBlinds, the new version 7+, does not work. Not only does it NOT change the display, more seriously, depending on the theme you select, it totally hoses up the display so that all you get is a black screen with a mouse cursor. I was trying this because my...
GPU Sometimes Doesn't Work in Graphic Cards
Hey all, Not sure where to post this so thought I would try here. Ever since I've put together my new PC I have had an issue with my wireless card. Sometimes when I start up my PC the driver doesn't load for it, I can see it in the device manager list but the driver hasn't loaded and when I...
WIN + Tab doesn't work but ALT + Tab does Has anyone else observed this?
Eight Forums Android App Eight Forums IOS App Follow us on Facebook