Bug ID 769741: TCP connection between mcp and tmm may get stalled

Last Modified: Oct 13, 2023

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,

Opened: Apr 05, 2019

Severity: 3-Major


TMM may get stuck at start-up and does not transition to ready state.


TMM does not complete startup, getting stuck on cmp_mpi. Traffic disrupted while tmm is offline.


The exact conditions remain unknown, however, the likelihood of this occurring increases with the number of TMMs.


1. Make the following modifications to profile tcp _mcptcp in /usr/lib/tmm/tmm_base.tcl: Change this: rcvwnd 4194304 To this: rcvwnd 131072 2. To apply the changes, run the following command: bigstart restart tmm

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips