If you have had a chance to play with the recenlty released Citrix Provisioning Services 5.1 and XenDesktop, or if you have read through the release notes you will have noticed that there has been a change in the soapserver port in this release, it has been changed to 54321

XenDesktop
TR-8213:
The default SoapServer port has been changed to 54321 to avoid a port collision when the PVS Server and the XenDesktop Server are installed on the same system.
XenDesktop users need to modify the Setup Tool's configuration file,"SetupToolApplication.exe.config" and change the ports from 8000 to 54321.

If a port conflict is encountered, the SoapServer port can be changed by running the following Mcli command:

"MCLI run setupconnection /p port=<new soapserver port number>"