Bug ID 669818: Higher CPU usage for syslog-ng when a syslog server is down

Last Modified: Jul 18, 2026

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

Known Affected Versions:
11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 12.0.0, 12.0.0 hf1, 12.0.0 hf2, 12.0.0 hf3, 12.0.0 hf4, 12.1.0, 12.1.0 hf1, 12.1.0 hf2, 12.1.1, 12.1.1 hf1, 12.1.1 hf2, 12.1.2, 12.1.2 hf1, 12.1.2 hf2, 13.0.0, 13.0.0 hf1, 13.0.0 hf2, 13.0.0 hf3

Fixed In:
13.0.1, 12.1.3, 11.6.3.3

Opened: Jun 19, 2017

Severity: 3-Major

Related Article: K64537114

Symptoms

Higher CPU usage for syslog-ng when a syslog server is down.

Impact

Potentially higher than expected CPU usage.

Conditions

A remote log server is added but it is not available.

Workaround

To mitigate this issue, use either of the following: -- Ensure that the remote log server is available. -- Remove the remote log server from the configuration.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips