Bug ID 605480: BIG-IP sends MP_FASTCLOSE after completing active close of MPTCP connection

Last Modified: Oct 16, 2023

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

Known Affected Versions:
11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.1, 12.1.2, 12.1.3,,,

Fixed In:

Opened: Jul 18, 2016

Severity: 3-Major


After completing an active close of an MPTCP connection, the BIG-IP sends MP_FASTCLOSE.


The BIG-IP retransmits MP_FASTCLOSE after the connection closing is complete until the maximum number of retransmissions is reached.


A TCP profile with Multipath TCP enabled is attached to a virtual server, and MPTCP performs an active close of a connection.



Fix Information

Fixed sequence of events on connection closure.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips