Last Modified: Dec 11, 2025
Affected Product(s):
BIG-IP DNS, TMOS
Known Affected Versions:
17.1.2.1, 17.1.2.2, 17.1.3
Opened: Nov 20, 2025 Severity: 3-Major
When multiple name servers for a zone are known, as soon as one name server responds with an error rcode, resolution is aborted and other name server are not tried.
DNS resolution will intermittently fail. DNS resolution will succeed only if the cache randomly selects a working name server to contact first.
-- DNS64 is configured. -- More than one name server is configured for a zone. -- One name server responds with an error rcode.
Disable DNS64.
None