Scan-related Issues
By opening Lists > Machine List, the scan status of each machine can be viewed:

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Green = last scan completed successfully.
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Red = last scan failed.
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Yellow = scan currently in progress.
ATTENTION:
machines highlighted in red with 0 logs have never been successfully scanned and the system is unable to retrieve their logs.
By navigating to Lists > Internal Events, an internal log can be consulted to review details of the detected issue.

This error states that the remote machine is not responding, possible causes include:
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The machine is powered off.
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The machine is unreachable on the network.
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The RemoteRegistry service is stopped or disabled on the target machine.
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A firewall is blocking communication between the server and the client.
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The target machine is missing update KB5003637 released from June 2021 onwards.
In addition to verifying that the machine is powered on and reachable (for example by using a simple ping) an effective diagnostic method is to test the connection through Event Viewer:
Open Event Viewer, then from the top menu select: Action > Connect to Another Computer.

Enter the name of the target machine. If required, specify a domain administrator account. For testing purposes, the same account configured for the BLogService can be used.
After a few seconds, the connection result will be displayed.

Depending on the connectivity issue, a message will appear on screen.
For example:

In this case Windows Firewall is blocking communication with the target machine.
Verify that Group Policies are correctly applied and ensure that the target machine does not have domain policy update issues.
Once logs from the remote machine can be successfully viewed through Event Viewer, the connection will also function correctly within BusinessLog.
