[Microsoft Learn]: never pin Azure SQL server FQDNs to specific IPs in hosts files, static CNAME records, or private DNS zones: the gateways are dynamic and change over time. If you allow-list by gateway IP, allow all gateway IP ranges for your region or use the Sql.[region] service tag. For private connectivity use Private Link or private endpoints instead of DNS overrides. Subscribe to Service Health alerts for gateway migrations in your region so a rotation does not surprise you.

Context: Hardcoded gateway IPs rot silently and produce intermittent connection failures.

## Matched source
Source: Source: https://learn.microsoft.com/en-us/azure/azure-sql/database/troubleshoot-common-errors-issues?view=azuresql
Original query: "Azure SQL: never pin the server FQDN to a static IP"
Key terms: azure, fqdn, never, server, static