Bug ID 757520: After a software upgrade, the BIG-IP system does not use the correct hostname for logging.

Last Modified: Jun 30, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP Install/Upgrade, LTM(all modules)

Known Affected Versions:
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, 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, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,

Fixed In:

Opened: Feb 04, 2019
Severity: 3-Major


After performing a regular software upgrade during which the configuration was rolled forward, the log messages for all daemons except tmm on the upgraded unit, report the default hostname (i.e., localhost) instead of the hostname assigned to the BIG-IP system.


There is no impact to the BIG-IP system itself. However, a BIG-IP Administrator may wrongly assume that the configuration failed to load the configuration due to the default hostname being visible in the logs. This is not the case; the BIG-IP system correctly loads the configuration post-upgrade. If you are concentrating logs to an external server this may make it difficult to determine where some logs originated.


Performing a software upgrade to BIG-IP version 11.5.6, 11.5.7, 11.5.8, or 12.1.4 while rolling forward the existing configuration. This can also happen when you first set up remote syslog on a new LTM on an affected version.


To work around this issue, run the following command: bigstart restart syslog-ng Note: This issue occurs only the very first time one of the affected versions is booted. Once the issue has been worked around once, the issue does not recur. Therefore, this workaround can be considered permanent.

Fix Information

After software upgrade, the BIG-IP system now uses the intended hostname for logging.

Behavior Change