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

Forum Discussion

Anzine321's avatar
Anzine321
Icon for Cirrus rankCirrus
Oct 26, 2023

PTR record not resolved

hi expert i have a issue on gtm ptr record not resolved i used gtm nslookup and ptr work properly but when i tried on client nslookup got timeout i dump using client ip and no respons on gtm any...
application delivery
Anzine321's avatar
Anzine321
Icon for Cirrus rankCirrus
Oct 26, 2023

on my pc >> ip listener f5 

nslookup ip address and i got timeout but on gtm i got result record

Samir's avatar
Samir
Icon for MVP rankMVP
Oct 26, 2023

It seems connectiviy is not there. Are you able to GTM listner from your PC? 

Try this to verify the conenctiviy.

nslookup www.abc.com GTMlistnet

i.e 
nslookup www.google.com 10.10.10.10

Here 10.10.10.10 is GTM listner IP address. If this works then setup is good else check the GTM setup.