KB1777: Add Standalone ESX(i) to Veeam
https://www.veeam.com/kb177720.06.2013 · If your virtual environment is not large and data traffic will not be significant, you can specify a smaller range of ports: for example, 2500-2510 to run 10 concurrent jobs at the same time. c. If the ESX host is deployed outside NAT, select the Run server on this side check box in the Preferred TCP connection role section.