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

Forum Discussion

Amr_Ali's avatar
Amr_Ali
Icon for MVP rankMVP
Jul 18, 2023

GTM Server name is unknown

Hello,  I configured A record on our GTM, but after using the nslookup tool on CLI to check the IP if The URL I find that the server name is unknown as in the below screenshot, I just ask is normal ...
application delivery
gtm
security
AubreyKingF5's avatar
AubreyKingF5
Ret. Employee
Jul 18, 2023

It's been a bit, but I think that happens when you do not have a PTR for your. NS. dig -t NS against the zone, also?

  • Amr_Ali's avatar
    Amr_Ali
    Icon for MVP rankMVP
    Jul 18, 2023

    how can I solve this, is there any article or link 

    • Paulius's avatar
      Paulius
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      Jul 18, 2023

      Amr_Ali For a PTR I believe you can configure that on the authoritative name server that particular PTR. I believe the NS issue would also be configured at the authoritative name server for that zone or sub-domain.

      • AubreyKingF5's avatar
        AubreyKingF5
        Ret. Employee
        Jul 24, 2023

        Yes. The authoritatve server would need to have that, so, depending on your authoritatve resource, could be a number of different ways to do that, but really.. I think that is the issue.