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bbfa235
(Get the code!)
In particular, one of the fixes introduced in samba 4.3.7 was to properly check certificates, as @mdeslaur said in comment #2:
"o CVE-2016-2113 (Missing TLS certificate validation)"
So I would ask you to double check your certificates and chain to make sure all is correct in that front, as samba would have skipped some validation checks before.