Description of the security update for SharePoint Enterprise Server 2016: April 11, 2023 (KB5002385)

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Client Based Certificate Authentication fails for NS GW with 503 error

The CBA fails with this error : Fetcher : getagclientcert got a fail response 503 - we see the 401 error in the IIS logs below: 10.99.60.190, -, 5/8/2017, 11:22:16, W3SVC1, WIN0215, 10.99.60.31, 170, 1573, 1605, 401, 5, POST, /certsrv/certfnsh.asp, -, 10.99.60.190, -, 5/8/2017, 11:31:44, W3SVC1,...