Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7
Fixed In:
14.1.0, 14.0.0, 13.1.0.8, 12.1.3.6
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.
This issue is now fixed.