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It seems a recent update to Bind due to CVE-2018-5743 in package Bind 9.9.4-74.el7_6.1 has caused zone transfers to start failing. There is an open discussion here started by one of my customers:
https://access.redhat.com/discussions/4222691
I have tried troubleshooting the issue here but with no luck despite multiple configuration tests.
I've now taken over two cases regarding this issue:
02405092
02409917
I've attached the cases to this Bug Report.