Symptom
Domain name configured will be overwritten after reloading the device.
Conditions
1. FTDv in Azure
2. Configure domain name through FTD cli.
configure network dns searchdomains
ex: configure network dns searchdomains cisco.com
Workaround
As a workaround:
1a. configure network dns searchdomains
2a. Go to expert mode
3a. Run the below command
chattr -V +i /etc/resolv.conf
Once done changes will persist across reboot
If you need to modify/change it again,
1b. Go to expert mode
2b. Run chattr -i /etc/resolv.conf
3b. Exit from expert mode, from the cli, configure searchdomains and follow above procedure [1a,2a & 3a].
