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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.

STEP 1STEP 2STEP 3STEP 4STEP 5

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.

Add Domain
4. Force AD sync.

@Chinmaya_Naik