Error on Citrix XML Service

"ERROR: The Citrix MetaFrame servers cannot process your request at this time. An error occurred while attempting to connect to the MetaFrame servers. Please make sure that the Citrix XML Service is running on the MetaFrame servers and listening on a valid port. If the Citrix XML Service is configured to share ports with the Internet Information Service (IIS), please make sure that the IIS WWW service is running."

1. Run IISRESET /stop on the web server to stop the IIS servers, not reset them.
2. Then run ctxxmlss /u to unregister the xml,
3. then run ctxxmlss /r80 to register it again on port 80.

Worked for me, hopefully you'll have the same results.