scvhost.exe port 1900 & explore.exe port 80 what to do?

Hi to everyone!
Can someone explain me why every time my system start up, CFP prompts me an alert message about an outgoing request of explore.exe on port 80?
I attached a screen shot for you, please have a look.
While you’re looking at same picture, could you even tell me if I’m doing the right thing to allow scvhost.exe on port 1900?
The alert message from which that rule came from was talking about something like upnp-mcast.
I read somewhere that it’s something safe to allow…is it true?
Time to time I have to answer at scvhost.exe that wants to go out though port 80…have I to stop it? and Why?

Thanks a lot for any help.

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