Environment:
Self-hosted 3CX on AWS Lightsail (Debian 12, dedicated/static public IP)
FQDN: *******.ks.3cx.us (3CX-managed FQDN)
Problem:
Over the weekend the IP that my 3CX FQDN resolves to changed on its own. I made no changes — no reboots, no stop/start, no manual IP or network edits, no...