Thanks for your help, I managed to solve the issue by navigating through the Firewall Wizard and finding out what exactly was being blocked for PDQ. Adding the server IP via a Trusted Zone also helped!
I'm experiencing some issue with PDQ Deploy as it fails to connect to a device while on a wireless network. When connected via ethernet the issue is resolved. Could ESET Endpoint Security be blocking anything from PDQ Deploy while connected via a wireless network?