Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

cwkim_261931's avatar
cwkim_261931
Icon for Nimbostratus rankNimbostratus
Oct 13, 2017

Ask Information : pool member down log message

Hi, I got log messages like this..     I try to find the info about that messages....   But I cannot found it....   Plz help me some info about that.  
application delivery
LTM
Andy_McGrath's avatar
Andy_McGrath
Icon for Cumulonimbus rankCumulonimbus
Oct 13, 2017

If you are using DSR then the IP address of the server in the response will be different, it should be the F5 Virtual Server address, hence why you are getting the error.

 

Recommend you change the monitor from 'tcp_half_open' to something else, I would first try with 'ICMP' to confirm it is working. Following that try the full 'tcp' monitor or an application specific monitor.