User with full control on a Sp19 site gets access denied

Michel AL HAYEK 187 Reputation points

A user with full access control on a SharePoint 2019 site is getting access denied. If the user is trying to create a new item or edit an existing one, he will b redirected to the access denied page. any idea about this bug?

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 17,141 Reputation points

    Hello @Anonymous ,

    Please perform troubleshooting:

    1.Sign in site as an admin and check this user permissions in site-level


    2.Sign in the list page as an admin and check this user permissions in list-level


    Echo Du

    Updated Answer ====================

    Hi @Anonymous ,

    Make the following troubleshooting

    1. Add this site to "Trusted sites"

    • Open IE browser >> Internet options
    • On the "Internet Options" windows >> Security >> Trusted sites >> Sites
    • On the "Trusted sites" panel, add the site URL and uncheck the "Require server verification Mode" checkbox


    • Click Close, and then click "Custom Level".
    • On the "Security Settings - Trusted Sites Zone" panel, scroll to the vety bottom and select "Automatic logon with current user name and password" option
    • Click Ok and Apply.


    2. Disable LoopBackCheck with PowerShell

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


    3. Delete this user permission and re-grant user “Full Control” permission

    Echo Du


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