Hi Ignacio,
I suspect you have BIMcloud Basic installed on the same computer where Archicad is running. This is strongly not recommended as Archicad won't let BIMcloud Basic enough resources, but other than that, this message is showing up because you also turned on the firewall of your mac.
Our BIMcloud Server CommandLineConfigurator Tool is used by the BIMcloud Monitor (tray icon) to check if the BIMcloud Server is up and running or not. Therefore, it starts a new client for each request, and these clients have a different port number, which causes the issue with the firewall.
To solve this issue, I suggest put all BIMcloud related applications and services to an exception list in your firewall settings, so you won't have this message again.
Kind regards,
Noémi Balogh
Community Expert, Admin