Bug ID 490713: FTP port might occasionally be reused faster than expected

Last Modified: Nov 07, 2022

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

Known Affected Versions:
11.4.1, 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, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.3, 11.4.1 HF9

Opened: Nov 13, 2014

Severity: 3-Major

Symptoms

FTP port is randomly selected and occasionally might be reused quickly.

Impact

FTP port might occasionally be reused faster than expected.

Conditions

FTP active mode. Source Port is set to change.

Workaround

None

Fix Information

FTP port selection uses a round robin method to avoid quick-reuse as much as possible.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips