Bug ID 1966405: Changes to DNS cache resolver may cause service disruption on BIG-IP DNS v17.1.2.1

Last Modified: Sep 13, 2025

Affected Product(s):
BIG-IP DNS, Install/Upgrade(all modules)

Known Affected Versions:
17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0, 17.5.1

Opened: Jun 09, 2025

Severity: 3-Major

Symptoms

All DNS PTR queries are forwarded to the configured forward zone. If any change is made to the local zones, such as adding a new local zone; the system begins responding to PTR queries with NXDOMAIN.

Impact

Queries respond with NXDOMAIN.

Conditions

Occurs on BIG-IP DNS version 17.1.2 and above Triggered when changes are made to local zones

Workaround

Restart tmm: bigstart restart tmm

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips