Bug ID 713066: Connection failure during DNS lookup to disabled nameserver can crash TMM

Last Modified: Oct 17, 2023

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,

Fixed In:
14.1.0, 14.0.0,,

Opened: Apr 02, 2018

Severity: 2-Critical

Related Article: K10620131


TMM restart as a result of a DNS lookup to disabled nameserver.


TMM restarts. Traffic disrupted while tmm restarts.


DNS lookup that tries to connect to a nameserver that is not reachable for some reason. This could be an explicit 'RESOLV::lookup' command in iRule, or it could be DNS lookups internally triggered by APM or HTTP.


Verify connectivity to nameserver. As an alternative, refrain from using RESOLV::lookup in iRules.

Fix Information

This issue is now fixed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips