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

Forum Discussion

tltl4866's avatar
tltl4866
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3 years ago

ConfigSync not Syncing

Hello, We are currently running into config sync issue on our F5-Big IP machines. The issue we are running into is that we are unable to sync both machines despite both machines being able to ping e...
application delivery
Juergen_Mang's avatar
Juergen_Mang
Icon for MVP rankMVP
3 years ago

Check the ConfigSync and Failover Network configuration of your devices and ensure that the SelfIPs for ConfigSync and Failover Network are configured to Port Lockdown "Allow default".

  • tltl4866's avatar
    tltl4866
    Icon for Altostratus rankAltostratus
    3 years ago

    Hello,

    I have set port lockdowns for self IPs as "Allow Default" but it's still not able to connect and sync.

     

    • AubreyKingF5's avatar
      AubreyKingF5
      Ret. Employee
      3 years ago

      Definitely want to check the anycast / multicast settings in the sync settings. If you can post a pic of that screen..

      • tltl4866's avatar
        tltl4866
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        3 years ago

        Hi, sorry for the late reply as I was on break and did not have a chance to get onsite. This is the screenshot you wanted to take a look correct?

         

        Also, can licensing be the issue to why HA is not working? In the command line, it keeps telling me to reactive license (even though I have done it multiple times, and the license file are present in the config).

        Lastly, we are going to considering using a non-producion switching environment for testing to see if it is our switching environment.