If your WiFi connection is not working with EpocCam, please try the following steps:
Check your firewall settings. Your firewall application can block the traffic between your PC and phone.
If you use the Windows Firewall, the Windows installer for EpocCam will automatically configure it to allow traffic.
If you are using third party firewall software like Norton or F-Secure, you will need to configure them to allow Bonjour-service traffic on UDP port 5353. Also allow 'KinoniSvc' to accept incoming connections to TCP port 5055.