DDNS unable update with Firmware 7.4.11 and 7.4.12

Forum|Forum|9 days ago
May 28, 2026
2 replies
789 views

Hi Everyone.

today we was encountered the Fortigate Dynamic DNS issue in firmware 7.4.11 and 7.4.12.

Restart the firewall few time still unable to access

even ping google.com also unable to resolve but when PING 8.8.8.8 from Fortigate is reachable.

In the Network → DNS → DNS server show Primary DNS and Secondary DNS server is unreachable.

Even the host name unable to resolve

FortiGate

Best answer by funkylicious

i think the confusion you are making is related to DNS over TLS ( TCP/853 ) which is enabled and used not working and not to Dynamic DNS which does something else.

setting it to DNS ( UDP/53 ) should fix your problem for now, but it could of been a problem with DOH on FortiGuard side.

funkyliciousAnswer

SuperUser

i think the confusion you are making is related to DNS over TLS ( TCP/853 ) which is enabled and used not working and not to Dynamic DNS which does something else.

setting it to DNS ( UDP/53 ) should fix your problem for now, but it could of been a problem with DOH on FortiGuard side.

"jack of all trades, master of none"