Bug ID 853613: Improve interaction of TCP's verified accept and tm.tcpsendrandomtimestamp

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,, 15.0.0, 15.0.1,,, 15.1.0,

Fixed In:

Opened: Nov 27, 2019
Severity: 3-Major


A TCP connection hangs occasionally.


TCP connections hangs, and data transfer cannot be completed.


-- The TCP connection is on the clientside. -- sys db tm.tcpsendrandomtimestamp is enabled (default is disabled). -- A virtual server's TCP's Verified Accept and Timestamps are both enabled.


You can use either of the following workarounds: -- Disable tm.tcpsendrandomtimestamp. -- Disable either the TCP's Verified Accept or Timestamps option.

Fix Information

This release provides improved interaction between TCP's Verified Accept and Timestamps options and the tm.tcpsendrandomtimestamp setting.

Behavior Change