Question of SSDP M-SEARCH on Windows 7

I have problems with SSDP M-SEARCH messages.
I have a client of discovery of device running on Windows 7 (laptop) computer and I send multicast message (M-SEARCH) on 239.255.255.250:1900 for a kind of discovery.
Everything works fine, as in my messages is received by the interested units (where I have a server running) and I can enumerate devices based on the responses I get servers.
But, at the moment where I have activate the WiFi on my laptop, things go wrong.
I don't see any of my messages SSDP M-SEARCH (I'm capture using WireShark), but I see a lot of SSDP (for 3 seconds) messages with a different value of ST (ST:urn:schemas - upnp - org:device:InternetGatewayDevice:1\r\n) Windows (some other app specific WiFi I guess)
And these SSDP messages completely block/hide message SSDP sending my request of customer.
I tried a lot of things to work around this problem, but the WiFi activation stops my client App works because my SSDP multicast messages are never sent.
Is it possible to understand what is happening and how to fix it?

Hi Girish,

I ask you to post the question in the TechNet forums, because they are better equipped to help you.

http://social.technet.Microsoft.com/forums/en-us/w7itpronetworking/threads

Please get back to us with any other questions you may have about Windows operating systems.

Tags: Windows

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