Windows 8.1 - Can't access share on Mac with valid credentials

Discussion in 'Mac OS X Server, Xserve, and Networking' started by SideStepSociety, Oct 22, 2014.

  1. SideStepSociety macrumors 6502

    SideStepSociety

    Joined:
    Feb 12, 2011
    Location:
    Vancouver, BC
    #1
    The title pretty well says it all.

    I can see my Mac mini Server in Windows browser, ping my IP, etc, etc. I am also able to log in as Guest and get access to the Public folder.

    However, I am unable to log in with any valid user accounts and credentials. Created a new, temporary test account and was also unable to access with that.

    Anyone have any thoughts?
     
  2. Gorazd, Oct 23, 2014
    Last edited: Oct 27, 2014

    Gorazd macrumors newbie

    Joined:
    Oct 23, 2014
    #2
    Hi,

    run regedit.exe as administrator on the Win 8.1 machine.

    Delete this DWORD line in the Win 8.1 registry and you shall be fine:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel

    You do not need to restart the Win 8.1 system in order that you can now successfully connect
    for example to the: \\MACMINI\HARDDRIVESHARE from Win 8.1 machine.

    You only need to fill the administrator name and password login for the Mac OSX computer
    and you shall now successfully map the Mac network drive on the Win 8.1 machine.

    Best regards,

    Gorazd.
     
  3. SideStepSociety thread starter macrumors 6502

    SideStepSociety

    Joined:
    Feb 12, 2011
    Location:
    Vancouver, BC
    #3
    That did it! Thanks Gorazd.

    Edit to add: Might be worth noting that the default value for this key is 3, and I got the same result by changing it to 3 from 2. Also, there's a small typo in your registry location. Should be:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel
     
  4. Gorazd macrumors newbie

    Joined:
    Oct 23, 2014
    #4
    Hi,

    Super!

    I am glad that it works for you!

    Best regards,

    Gorazd.
     
  5. cricrimi macrumors newbie

    Joined:
    Jan 28, 2007
    #5
    same with xp and yosemite

    Hi all,

    I have an imac hooked up on my network as well as an ultrasound machine (running xp in some form), both visible on the network.

    Up until mavericks, I had a shared folder on my imac to which I could back up ultrasound picks directly from the ultrasound machine with user/pswd credentials. It worked through all my upgrades from Mountain lion through snow leopard and mavericks.

    But not with Yosemite: The ultrasound machine only gets a login failed, unknown user name/bad password reply although nothing has changed.

    I can only link the bug to yosemite but aside from making sure all the sharing options are correct, am stuck!

    Really need this link for medical purposes

    Thanks for any insight!!

    Chris
     
  6. chucktowndcroz macrumors newbie

    Joined:
    Dec 16, 2015
    #6

    OMG SO MUCH RESEARCH! THANK YOU SO MUCH. I made an account just to say thank you
     
  7. LoneBoneman macrumors newbie

    LoneBoneman

    Joined:
    Mar 16, 2018
    #7
    Does this work with Windows 10 network? Hesitate to mess with registry and create other problems. I have been trying all kinds of "fixes" for this issue which seemed to appear rather recently. Nothing seems to work. My wife and I are on the same home network and same Workgroup. I can see the Mac, but cannot access it to be able to access files. She can however access my windows 10 computer (and obviously see it as well).
     
  8. LoneBoneman, Mar 17, 2018
    Last edited: Mar 20, 2018

    LoneBoneman macrumors newbie

    LoneBoneman

    Joined:
    Mar 16, 2018
    #8
    I have the same issue with windows 10. Started mysteriously on it's own as I made no changes to anything. Able to see Mac on the network, but unable to access anything. Inconvenient to attach files to emails when all computers are in the same house. The DWORD is set to 1. Should it be 3 or delete entirely?

    I tried the following and it worked immediately. Perhaps before messing with the registry, give it a try first:

    "OSX will ONLY accept LAN network authentication level 2 responses only. Windows default for this value is not set.

    To fix this go to on the Windows side: Control Panel > Administrative Tools > Local Security Policy > Local Policies (on left panel) > Security Options >

    "Network Security: LAN Manager Authentication Level" > Set this to "Send NTLMv2 responses only"


    https://www.reddit.com/r/osx/comments/3r5q16/cant_access_my_mac_from_windows_10/
     

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