Generally Available: Custom port support for Azure Database for MySQL – Flexible Server

You can now configure a custom port (25001–26000) during server creation for both public and private access-enabled servers—enabling you to integrate more easily with existing applications and improve alignment with security postures. By default, MySQL servers operate on port 3306. 

Feature highlights: 

• Custom port configuration. Specify a port of your choice in the 25001–26000 range during server provisioning. 

• One port per server. Only one custom port per server is supported. 

Supported scenarios: 

• Server creation 

• Restore (including cross-port restore) 

• Read replica creation 

• High availability (HA) with custom port 

Current limitations: 

• Custom ports can’t be changed after they’re created. 

• Geo-restore and geo-replication aren’t yet supported. 

Learn more.