Thanks for the response.
My slingbox Pro is working fine via the Internet, but it uses port 5001 and in my router all packets using port 5001 are forwarded to the Slingbox
But another piece of software (ownCloud) also wants to use port 5001)
My question should have been clearer; How do you change the port in the HD Pro to use something different to the default port of 5001?
Thanks and regards