Vista - net.tcp port sharing service - any disadvantages?

Hi,

I'm developing a set of services for a software solution.
It will be broken down in several application including a few
windows services.

It is very likely that most of these services will run on one
(server) computer but we can't enforce that.

To make support and configuration a little easier, I was
thinking about using port sharing, so all services could run
on the same port.

I've found a few examples on how to setup port sharing and
this is all very easy. But how about any disadvantages?
This subject isn't exactly wide spread on the web and I just
can't find any negatives about it.

Should there be any reason for system administrator NOT
to like port sharing?


Thanks,
Marcel