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tjoll66's avatar
tjoll66
Icon for Altocumulus rankAltocumulus
Dec 23, 2025
Solved

VIP is not responding on SYN after enabling other modules like ASM, APM and AFM.

Hi all, I have an F5 VE running 17.5.1.3 in my lab environment for learning purposes. As back-end I installed the phpauction webpage and all configuration works flawlessly if only the LTM  module ...
application delivery
deployment
  • tjoll66's avatar
    tjoll66
    Feb 13, 2026

    Hi All,

    Let's give a quick update regarding my issue for anybody that runs into the same issue. 

    My license was renewed so I could create a TAC case for my issue. TAC rebuild my system in their lab and found a DB value that was still enabled after deprovisioning AFM. See https://my.f5.com/manage/s/article/K16849 for more information.

    Running the following command solved my issue: # tmsh modify /sys db tm.fw.defaultaction value accept

    I'm still looking for information why I haven't found any log entries regarding this setting/dropped traffic.

    Thanks all for your input. 

Aswin_mk's avatar
Aswin_mk
Icon for MVP rankMVP
Dec 24, 2025

Hi,

Did you check the CPU,RAM required for new modules (vCPU,RAM).

 

BR
Aswin

tjoll66's avatar
tjoll66
Icon for Altocumulus rankAltocumulus
Dec 26, 2025

Hi, 

CPU and RAM seems to be okay. I've got 8vcpu's and 64GB of ram. I would be surprised if the F5 needs more for only 1 vip in a lab environment with about no traffic passing. I did check some memory related logs like OOM but I could not find any.