Wireless Barcode Scanner

I have 2 wireless barcode scanners. I created an application in C # that reads a barcode and sends data to a web service, which then processes the data and does further processing. When I start the application, it first tries to connect to the web service and only continues if the connection is complete. The problem I am facing is that if I deploy the application through visual studio then it works fine and connects to the webservice. But if I just copy the content (exe and config files) manually, then it gives an error that the hostname is unknown. Can someone please help me understand how this link works? Does the scanner need any special settings that visual studio makes automatically during deployment?

Thanks and greetings.