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Originally Posted by abailey152
Yep, it's Universal Plug and Play (Pray???  ). Unless you actually need UPnP, port 1900 can be blocked.
I had to open it up, however, to use some voice functions in Windows Messenger via Internet Connection Sharing through my LAN. ICS runs as a software router, so it needs to be UPnP capable for Messenger to be able to assign ports for the voice functions. At least this is what Microsoft KB said!  |
Also, to completely stop & disable the UPnP service in XP (unless you actually need it for some reason):
Goto "Start", then "Run", & enter "services.msc" & hit OK (or go to the "Services" tool in the Administrative Tools section in the Control Panel).
Look through the list of services for these entries: "Universal Plug and Play Device Host" *and* "SSDP Discovery Service".
Double click on one, Stop it, & then change its startup type to "Disabled" & hit "Apply". Then Stop & Disable the other of these two services.
Or, you can simply use GRC.com's "UnPlug N Pray" app to stop & disable the UPnP services:
http://www.grc.com/unpnp/unpnp.htm (also info there on UPnP).