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

Forum Discussion

bongshanks's avatar
bongshanks
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Jan 17, 2018

Debugging a non functioning HSL config

Ok, I've got a pretty simple iRule that works fine when using the log local0. command. When I change the local.0 to HSL, the HSL does not log. I check the pool and the monitor on 514 is showing gr...
irules
security
TMOS
Ilian_Ivanov's avatar
Ilian_Ivanov
Icon for Nimbostratus rankNimbostratus
Jan 19, 2018

Hello,

 

If when you use local.0 and it is working as expected, proceed troubleshooting with capturing the traffic with tcpdump in order to see if there is some outgoing traffic when the iRule is executed. When you are using HSL don`t expect to see something in the ltm logs.

 

Also check your pool monitor. If you have applied UDP monitor only, it is not enough. You need to add also ICMP.

 

Regards