Last Modified: Jul 18, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8
Fixed In:
12.0.0, 11.6.1, 11.5.4
Opened: Jun 30, 2015 Severity: 3-Major
TMM can crash while processing DNS requests on a TCP virtual server.
Traffic disrupted while tmm restarts.
A TCP DNS virtual server combined with a DNS iRule that suspends and a client that closes its connection before receiving a response to its DNS request.
While no true workaround exists, the situation can be avoiding by removing any one of the conditions above.
TMM now properly handles DNS requests through a TCP virtual where the client closes the connection during iRule processing.