''Communication with rekordboxAgent failed.” appears when I start rekordbox ver. 6.

rekordbox ver. 6 communicates with the rekordboxAgent application running on the same computer.

Sometimes the communication between these applications is not working properly due to anti-virus software or VPN software.

Check to see if you can solve the problem by temporarily disabling your anti-virus or VPN software.

If your anti-virus software has the function to exclude certain applications from being blocked by the firewall, add rekordbox and rekordboxAgent to Exceptions.

If your VPN software has the function to bypass the VPN only for specific application communications, bypass the communication between rekordbox and rekordboxAgent.

For details, contact the manufacturer of your anti-virus software or VPN software.