What is ths alert?

What is this alert from laptop trying to connect to desktop?

Also, sometimes an alert will close before permission can be given. Is there anyway to get the comodo GUI back to give permission?

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Once a popup has disappeared it cannot be retrieved. You can increase the duration of alerts in the settings, but once the time has elapsed the default deny behavior takes over and the connection is blocked/dropped and should be logged.

ok where do I unblock it then? Will it be blocked next time or will it ask again and why is the laptop connecting to the desktop?