Could not connect to Veeam ONE Monitoring Server specified in Settings > Client Settings.

2. Verify that the specified server is a Veeam ONE Monitor Server and that the service is running.
   1. Remote Desktop to the specified server
   2. Open the Services list ( services.msc )
   3. Verify that the service named Veeam ONE Monitoring Service is present.
      
      • If present, ensure that the service is Started.
      • If not present, that server is likely not the Veeam ONE Monitor Server.
3. If the Veeam ONE Monitoring Service fails to start, review the following options:
   • Open Veeam ONE Setting UtilityC:\Program Files\Common Files\Veeam\Veeam ONE Settings\VeeamOneSettings.exe and use the Test button to verify that the connection to the SQL Database is functional.
     
     If the test fails, ensure that the specified SQL Instance is running and can be reached from the Veeam ONE Monitor Server.
   • Review KB2261:Veeam ONE Services cannot be started

Remote Client Connectivity

If the Veeam ONE Monitoring Service is running, and the Veeam ONE Client still cannot connect, review the following:

1. If using hostname or FQDN to specify which server the Veeam ONE Client should connect to, ensure that the machine can resolve the specified hostname or FQDN.
2. Review the Firewall on the Veeam ONE Monitoring Server and any firewalls between it and the server where the Veeam ONE Client is running:
   • 139 TCP
   • 445 TCP
   • 137 UDPAs this is UDP, it cannot be tested using Test-NetConnection.