Ensure that no application on computer %ServerName; listens for HTTP traffic on TCP port %TCPPort; during the P2V conversion. ...

Ensure that no application on computer %ServerName; listens for HTTP traffic on TCP port %TCPPort; during the P2V conversion.

 Alternatively:
On the VMM management server, create a DWORD registry key at HKLM\Software\Microsoft\Microsoft System Center Virtual Machine Manager management server\Settings\P2VBITSTcpPort, set its value to the port number you want to use, and then restart the VMM service.