About a year ago I configured my System Center Configuration Manager 2012 environment to deploy my endpoint protection updates automatically to my clients. All has been working perfectly until two days ago. The server appears to be downloading and automatically deploying the definition updates. However, the clients are not receiving them. Whenever I force a manual update of SCEP on one of my clients, it attempts to download the definitions 3 times, then gives me the error that there is a connectivity problem between the client and the server. I can definitely ping the server and the Windows firewall has been turned off on the server. To my knowledge, nothing has changed in my environment. Which log files do i need to be looking in for more information?