Did you check if you had an antivirus running on your Windows 10 ?
Also, you have to put the IP of your server when you are installing the OCS agent on your client.
Then, your windows 10 client and OCS server can ping each other ?
Furthermore, did you make a tutorial of your 2.4 OCS server installation because I have some issues with it ?
PS : Sorry for my bad English I can speak French if you need.