On Sat, 9 Aug 2003 17:03:12 -0400, "mto"
<nobody@dontsendmeanyspam.com> wrote:

>Okay - every single one of those Microsoft Windows rejects specifies Port
>1900, which IANA lists as
>
>"ssdp 1900/udp SSDP"
>
>SSDP = "Simple Service Discovery Protocol" - has to do with
>networking/multicasting (which is installed by default in XP.) The protocol
>is at http://www.upnp.org/download/draft_cai_ssdp_v1_03.txt
>
>That states - among much else that I am not engineer enough to interpret -
>
>" Discovery occurs when a SSDP client multicasts a HTTP UDP discovery
> request to the SSDP multicast channel/Port. SSDP services listen to
> the SSDP multicast channel/Port in order to hear such discovery
> requests. If a SSDP service hears a HTTP UDP discovery request that
> matches the service it offers then it will respond using a unicast
> HTTP UDP response. "
>
>What do you think? Bug in the OS?
>
>

Go to http://www.sysinternals.com/ntw2k/source/tcpview.shtml and
download TCPView. This nice application will tell you what process is
listening on what port.

Seems to me that MSN Messenger listened or had something on 1900.