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.
Used Ports - Veeam Plug-ins for Enterprise Applications
helpcenter.veeam.com › docs › backupAug 05, 2021 · TCP. 2500 to 3300**. Default range of ports used as data transmission channels. For every TCP connection that a backup process uses, one port from this range is assigned. * For NFS share, SMB share repositories, and Dell EMC Data Domain, HPE StoreOnce deduplication storage appliances, Veeam Backup & Replication uses an auxiliary backup infrastructure component — gateway server.