System error 121 has occurred. The semaphore timeout period has expired. RRS feed

  • Question

  • Hi,

     I'm trying to access to a LAN folder and since 2 months this is returning me the following error. 

    Command used : Net use ...xxxxxx xxxxx xxxx xxx / xxxx xxx 


    "System error 121 has occurred.

    The semaphore timeout period has expired."

    After the patch "Feature update to Windows 10 Enterprise, version 1607 ", the issue was solved but the next day some other patches were installed and broken the connectivity again.

    - I've reinstalled the driver and it didn't fix the issue.

    - The patch that caused this seems to be Security Update for Microsoft Windows (KB3200970).

    - Another possible could be Update for Microsoft Windows (KB4023834).

    Both together make me lose the connectivity with the SAMBA servers.

    How this can be fixed?


    Tuesday, July 25, 2017 8:13 AM

All replies

  • Try disabling SMB 3 on the client see if that helps the connection.

    • To disable SMBv2 and SMBv3 on the SMB client, run the following commands:
      sc.exe config lanmanworkstation depend= bowser/mrxsmb10/nsi
      sc.exe config mrxsmb20 start= disabled
    • You must run these commands at an elevated command prompt.
    • You must restart the computer after you make these changes.

    From How to enable and disable SMBv1, SMBv2, and SMBv3 in Windows

    Tuesday, July 25, 2017 9:08 PM
  • Hi,

    There is a similar case can be regarded as a reference.

    You could try solution here to test result.

    Click Start > Run, enter regedit , and click OK.

    Expand the following registry subkey: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NDIS\Parameters

    Right-click ProcessorAffinityMask, and click Modify.

    In the Value data box, enter 0xFFFFFFFE , and click OK.

    Quit the Registry Editor.

    Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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    Wednesday, July 26, 2017 6:50 AM