Fortigate - Shorten TTL for FQDN Address

[johnycoms]

Hi

Fortigate 101F

Version 7.6.0

I'm trying to reduce the TTL for a number of fqdn addresses by setting the cache-ttl on the address object itself.

When the default cache-ttl is set to 0, and also the global setting for fqdn-cache-ttl is set to 0, it is using 2400 seconds - which I assume is from the DNS query response. (The Fortigate is configured to use our DCs for DNS)
. 

To overcome this, I have set the cache-ttl to 60 under the FQDN type address object, but it continues to use the 2400 timer?.

I am checking this by using command - diag test app dnsproxy 6 

Any help much appreciated

FortiGate