KB1580: Veeam ONE Monitor Client Cannot Connect to Veeam ...
https://www.veeam.com/kb158027.04.2012 · Solution. These are the most common situations that we recommend checking: 1. Make sure Veeam ONE Monitor Server service is up and running. 1. The name of the Veeam ONE Monitor Server is correctly specified in the Veeam ONE Monitor client settings. 2. The Veeam ONE Monitor Server is reachable from the machine where Veeam ONE Monitor Client runs.