Last Modified: May 05, 2026
Affected Product(s):
BIG-IP DNS
Known Affected Versions:
15.1.10.8, 16.1.6.1, 17.5.1.6
Opened: Apr 26, 2026 Severity: 4-Minor
The file /config/gtm/ldns.gz remains at 20 bytes (gzip header only) and contains no path or persistence records, even though GTM path and persistence entries are visible in memory via tmsh commands (show gtm path, show gtm persist).
When the gtmd process is restarted, it is not to restore the previously known path and persistence records from ldns.gz and must relearn them through new DNS requests sent to members of the DNS sync group.
The issue occurs when BIG-IP DNS is configured with GTM path and persistence record collection, and DNS queries are actively processed. Despite path and persistence records being visible in memory through tmsh commands, the scheduled dump process does not save these records to the /config/gtm/ldns.gz file.
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