FMC 7.4.2.1-30 unsets/sets DNS domain-name every day

Network Diver · ‎04-22-2025

Hi,

We have FMC 7.4.2.1-30 and Firepower 1120/1150 with the same release. Every morning the FMC wants to deploy the following changes on all firewalls, although nothing has been edited on the FMC during the night:

dns server-group DNS_Intranet
 no domain-name my.example.com
exit
dp-tcp-proxy
crypto isakmp nat-traversal
dns server-group DNS_Intranet
 domain-name my.example.com
exit
crypto isakmp nat-traversal

It just removes and adds the DNS domain-name of a DNS server group. The changes are marked as "modified by system".

Any idea what is causing this?

Network Diver · ‎04-29-2025

If this is a bug, then it's also in FMC/FTD version 7.4.2.2-28