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

    Summary
    When using the Call Web Service action to copy an item from one site to another, the workflow errors with: The Remote Server Returned An Error: (401) Unauthorized

    Solution
    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