Did you push the agent to the client machines which are added to the ePO server from AD sync task?
If yes then are those machines communicating to the ePO server?
In the ePO server, is the machine status showing managed or unmanaged?
If machines are simply added to the ePO without agent then ePO ping function will not work.
For ping function to work, On the client machines, agent should be installed and should be communicating to the server.
Additionally if using firewall then you have to add Apache to firewall exception.
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To ping those machine within the ePO console, epo itself use systems details from the database.
It won't resolve the ip from the hostname, cause he need to know the IP, that means that so as long as the agent DON'T talk back with ePO you won't be able to ping it from the console...
I would like to install the agent from the ePO console
install the agent without using ePO. I still can not ping the machine from ePO.
my firewall is disabled
do you see them managed ?
can you ping them from the windows CMD ?
Additionally I will suggest you to share the below logs just after reproducing the issue (select the machine in the ePO server=>Ping).
EpoApsvr.log and server.log (\program files\McAfee\ePO\DB\Logs).
Orion.log (\Program files\McAfee\ePO\Server\Logs).