KB2127: Console Error - Failed to connect to Veeam Backup ...
https://www.veeam.com/kb212721.04.2016 · The server specified in the Console connect window is incorrect. This can occur in environments where the Veeam Backup & Replication Console is installed on a different machine than the Veeam Backup Server, and the Veeam Backup Servers hostname or IP has recently changed. Check connection settings and ensure the correct server has been specified.