KB1647: The specified transports are not available - Veeam
www.veeam.com › kb1647The issue is caused by an unreliable network connection between the Veeam Backup & Replication server and the vCenter Server. Solution. Update network drivers on both the Veeam Backup & Replication server and the vCenter Server and make sure the connection between the servers is stable and reliable. Click hereto send feedback regarding this KB, or suggest content for a new KB.
Transport Modes - User Guide for VMware vSphere
helpcenter.veeam.com › transport_modesApr 26, 2021 · A transport mode is a method that is used by the Veeam Data Mover to retrieve VM data from the source and write VM data to the target. Job efficiency and time required for job completion greatly depend on the transport mode. For data retrieval, Veeam Backup & Replication offers the following modes (starting from the most efficient):