SMB servers that have to be accessed by clients that do not support GSS authentication must have SmbServerNameHardeningLevel set to 0 (the default).
AD / EXC cartridges adopt a third party jar j-interop.jar to run WMI queries and it only supports NTLM /NTLMV2 authentication currently. Hence it blocks the SMB connection.
Starting with version 5.6.6 of Active Directory and Exchange cartridges, below requirement has been added to the Release Notes as one of the Pre-requisites:
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