Bug ID 470402: Connection mirroring fails for active FTP with multiple transfers

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9

Fixed In:

Opened: Jul 04, 2014
Severity: 3-Major
Related AskF5 Article:


When there are multiple transfers on an active FTP connection, the mirroring can intermittently fail. When observing the tmsh show sys conn on active and standby units, the data connection may appear only on the active BIG-IP.


If a failover occurs, active FTP sessions will receive aborts. This does not affect passive FTP transfers.


This is most likely when the connection between the BIG-IP and the FTP server exhibits lower latency and higher throughput than the connection between the active and standby BIG-IP. Not all connections will be affected.


This issue has no workaround at this time.

Fix Information

Active FTP connections will be properly mirrored, and failover will work as expected.

Behavior Change