Thanks @_Val_
I already resolved the issue.
Thanks for the mention that sk83721
On my case, I have Endpoint Server without any domain (Active Directory). I already mention that Windows 8 is working fine but I have an issue with W10 and W7 because of that two testing machine DOMAIN assign already so the Endpoint Client Machine unable to communicate with Endpoint Server.
So I just remove the domain from the W10 and W7 test machine and configure without DOMAIN.
Done 🤗
As per the sk83721: AD is already integrated with Checkpoint Endpoint Server but somehow after installing the Endpoint Agent some machine is unable to connect to Endpoint Server and showing "Disconnect" ["Endpoint client cannot register to the server. Security ID of this machine was not found. Please contact your administrator."]
Solution :
1. Reset machine from Endpoint Security console.
2. Remove the machine from the domain. (Same as I mentioned above)
3. Add the machine to the domain.
4. Force AD sync.
