A communications company received an alert from their host saying their .ie domain wasn’t resolving. Their .com site was fine, but anyone typing the Irish address hit a dead end.
The DNS zone for the .ie domain had no working records and hadn’t been updated in over a decade. When the main site moved to modern hosting behind a CDN, the .com was configured properly, but the .ie was forgotten. The fix is to bring the .ie zone in line with the .com, using the exact values from the host so SSL and routing work on both.
This is one of the most common things I find when I take on a new client. Businesses register their .ie and .com, and years later only one of them is looked after. For an Irish business, the .ie is often what customers type first, so it’s worth checking every domain you own actually goes somewhere.