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Sending HTTP response 401 - text/plain:401 UNAUTHORIZED.

Hanamichi Sakuragi 246 Reputation points
2020-09-01T11:58:16.31+00:00

Hi All,

I am getting Sending HTTP response 401 - text/plain:401 UNAUTHORIZED this error in ULS.

I can access all the sites on WFE.

Do you know where that issue coming from?

Thank you.

SharePoint Server Management
SharePoint Server Management
SharePoint Server: A family of Microsoft on-premises document management and storage systems.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Echo Du_MSFT 17,176 Reputation points
    2020-09-02T08:52:28.337+00:00

    @Hanamichi Sakuragi

    According to my understanding, you faced the following situation:
    When you access SharePoint Sites through IE browser on the SharePoint Server, the system will prompt you to perform 3 times authentication, and then you will receive the "HTTP 401.1-Unauthorized: Login failed" error. But SharePoint Sites can be accessed normally on the WFE Server.

    This is because the "local loopback check" only permits NT Authentication to the localhost address for defined hostnames.

    Please run the following PowerShell in the SharePoint Management Shell to disable Loopback Check: 

    New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name “DisableLoopbackCheck” -value “1” -PropertyType dword

    You could refer to this article SharePoint 2013: Disable Loopback Check

    Thanks,
    Echo Du

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