Bug ID 1785385: Intermittent traffic failures when tenant is running BIG-IP v17.1.2 or above and host is on version prior to F5OS-A 1.8.0 or F5OS-C 1.8.0

Last Modified: Feb 03, 2026

Affected Product(s):
BIG-IP Install/Upgrade, LTM(all modules)

Known Affected Versions:
17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 21.0.0, 21.0.0.1

Fixed In:
17.5.1.4

Opened: Jan 09, 2025

Severity: 1-Blocking

Symptoms

Intermittent traffic failures for a tenant running BIG-IP v17.1.2 or above. This often manifests as ICMP monitors failing.

Impact

Intermittent traffic disruption. This often manifests as ICMP monitors intermittently failing, but will also impact virtual server traffic and other protocols (e.g. UDP and TCP).

Conditions

- Tenant running BIG-IP v17.1.2 or above - Host is one of the following platforms: -- r5000, r10000, or r12000-series appliance -- VELOS - Host is running a version prior to F5OS-A 1.8.0 (rSeries appliance) or F5OS-C 1.8.0 (VELOS chassis)

Workaround

Upgrade F5OS to version 1.8.0 or higher.

Fix Information

New FPGA bitstreams in F5OS-A 1.8.0 and F5OS-C 1.8.0 resolve this issue.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips