jep6591 wrote:I'm not sure what PID 4 is.
That is a http proxy service provided by Microsoft for sharing one http port simultaneously for multiple applications.
Basicly that is a great idea, but practically only for that interface designed processes are able to participate from it (which Apache is not).
The problem with that proxy service is, that it is mostly intransparent which application is using this port because all is hidden behind that proxy.
A short list of programs known for using this proxy and port 80 can be found here: viewtopic.php?f=16&t=58765&p=220603#p220603
jep6591 wrote:Can I configure Apached to use another port?
Yes, but that will have other sideeffects. You will need to add this new port to every request and your applications must be designed to be able to run with different ports.
So, if there are other ways i would always choose one of them.
jep6591 wrote:And if so, what is the number?
I think i don't understand that question.