A free tool called “App-V Ping tool” is available and can be used to check if an Microsoft Application Virtualization Management and/or Streaming server is available from a Client-Side perspective. For example, with use of a startup script, which runs on the client device, you can use this tool to check if the nearest by and configured App-V Streaming Server is available and responding properly and if not point the App-V Client to another, maybe central App-V Management or Streaming Server. The tool does not only check if the RTSP port 554 is still alive, but even if it is still really accepting RTSP streaming requests.
Download at http://www.immidio.com/. Look for the Immidio Resourse Kit if you can’t find it.