Changing TCP Port 80 to 8080 in ITMS 7.1

Does anyone have experience from large environment of Altiris (ITMS), of modifying default port 80 to anything else?

• How did that go? Any technical issues faced, not predictable from manuals or KB articles?
• How long timedid  it take and how many clients were lost as result of long term absence or machines reimaged?
• Did you have additional resources for that activity, or did you do it as BAU? Did that visibly affected daily operations?

Any experience from real life is welcome.

Thanks, Jan