To provide proxy address neutrality, in particular for mobile server devices, a server application can register its network address with a discovery application. Whenever the server application acquires a new network address, the server application updates the discovery application. A client application providing proxy services for the server application can invoke calls to the server client using the network address for the server application that is currently stored in the client device. If the current network address is invalid, the client application obtains an updated network address from the discovery application.