Yahoo mail issue due edns

Hi vishu_chavan,

I have a couple of ideas that you might need to check. Are you using ZoneRunner (Local BIND) at all, or is all of your DNS traffic just going to Wide-IPs? Do you get positive results from the ISC genreport tool or the ISC EDNS compliance test website? https://ednscomp.isc.org/ 

I'll assume you saw the relevant KB, but i'll paste it here: https://support.f5.com/csp/article/K07808381

Unfortunately the 11.x branch is quite old, is there any possibility of upgrading to a later version?

Thanks,
Josh

HI  josh

Thanks for adivise .We upgrade to 11.5.8 version and issue resloved.

Thanks you