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I have this 2 PCs inactive in the SCCM console.
The SCCM agent client is installed. The firewall on the clients is OFF.
How can I check if the communications between SCCM and client isn't blocked?
If you have just installed the client agents, I would suggest you to wait for some time. The PC may not be communicating with the management point correctly. Start by checking the Configuration Manager properties > actions tab and see how many actions do you see.