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A DNS Validating Resolver incorrectly validates DNS responses received from A queries made as a result of a front-end AAAA query received on a profile with DNS64 configured. A SERVFAIL response may be sent to the client unless the Validating Resolver cache has previously successfully validated a front-end A query. In this scenario where the A records already exist in the cache, the expected DNS64 AAAA records are synthesized.
Incorrect SERVFAIL responses for AAAA queries that should get valid responses.
This issue may be observed with a DNS Validating Resolver configured on a DNS profile with DNS64 configured when processing AAAA queries.
None.
DNS validation now occurs as expected, resulting in valid answers to AAAA queries.
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