Last Modified: Jun 28, 2024
Affected Product(s):
BIG-IP TMOS
Known Affected Versions:
17.1.0.1, 17.1.0, 16.1.3.5, 16.1.3.4, 15.1.8.2, 14.1.5.4
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.
TMM will not unexpectedly reset connections when tunnels are in use.