Users get intermittent credential prompt on client browser when using IIS Windows Authentication, after Domain Controller installed Windows Security Patch 5009557.
There is a known issue for 5009557 - “After installing this update on domain controllers (DCs), affected versions of Windows Servers might restart unexpectedly.”
The Domain Controller reboot intermittently will cause IIS Windows Authentication failure intermittently and thus end users will get intermittent credential prompt on client browser.
The issue is fixed in patch 5010791. Install patch 5010791 on Domain Controller will address the problem stated above.
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