This issue may not be yet resolved completely. The workaround for now would be:
1. Remove the Network Threat Protection feature from SEP client
Got to add/remove programs (Programs and features) - Select SEP and click on change, modify and remove the NTP component. Reboot the computer
2. After removing NTP, go to Start . Run and type in services.msc. restart the Windows Firewall/Internet Connection Sharing(ICS) Service.