Challenge
The Reporter collection job finishes with the Warning status due to sockets number exceeded. To make sure this is the case, open the Reporter web page and navigate to Configuration > Sessions node and double-click the corresponding session, scroll to the bottom of the job log and find the [warning]: Sockets number exceeded line.
Cause
Behavior by design.
Solution
The data in the reports will only be available for the hosts included in data collection on Veeam One Monitor side (Monitor UI -> Options -> Server Settings -> Monitored Objects\Hosts\VMs (depending on Veeam One version)).
More Information
If you have any questions, contact Veeam Support.