KB1731: Veeam ONE v9.5 Required Ports and Permissions
https://www.veeam.com/kb173101.03.2013 · Veeam License Update Server (autolk.veeam.com) TCP. 443. Default port used for license auto-update. Veeam ONE Server and Web UI. Microsoft SQL Server. TCP. 1433. Port used for communication with the Microsoft SQL Server on which the Veeam ONE database is deployed. Additional ports may need to be open depending on your configuration.