Bug ID 1290889: TMM disconnects from processes such as mcpd causing TMM to restart

Last Modified: Jan 19, 2024

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

Known Affected Versions:, 17.1.0,,,,

Fixed In:
17.1.1, 16.1.4, 15.1.9

Opened: Apr 19, 2023

Severity: 2-Critical

Related Article: K000134792


When tunnels are in use on the BIG-IP, TMM may lose its connection to MCPD and exit and restart. At the time of the restart, a log message similar to the following will be seen in /var/log/ltm: crit tmm6[19243]: 01010020:2: MCP Connection expired, exiting When this occurs, in a default configuration, no core file is generated. TMM may also disconnect unexpectedly from other services (i.e. tmrouted). TMM may also suddenly fail to match traffic for existing virtual server connections against a connection flow. This could result in traffic stalling and timing out.


-- Traffic disrupted while tmm restarts. -- Sudden poor performance


-- An IPsec, GRE or IPIP tunnel is in use.


Do not use tunnels.

Fix Information

TMM will not unexpectedly reset connections when tunnels are in use.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips