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    Nintex Knowledge Base

    Error "'The Remote Server Returned An Error: (401) Unauthorized" in Call Web Service

    Status: Validated

    ISSUE
    When using the Call Web Service action to copy an item from one site to another, the following error might occur:
     
    The Remote Server Returned An Error: (401) Unauthorized
    ERROR CODE
    RESOLUTION
    1. Attempt to access the web service end point via the browser on all Web Front End servers.
    2. Locate the server where the web service end point fails.
    3. Execute one of the following steps to disable loopback check on the Web Front End server:
      • Via an administrator SharePoint Management Shell window run: New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name "DisableLoopbackCheck" -value "1" -PropertyType dword
      • Manually disable loopback checking in the registry:
        1. navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
        2. Create a DWORD32 entry for DisableLoopbackCheck
        3. Set the value to 1

    Additional information from Microsoft
    ADDITIONAL INFORMATION
    RELATED LINKS
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