I hate to beat a dead horse, but since I'm new to this forum I'm going to kick the pony a bit.
I'm having this problem getting SSDP Discovery to work. I'm monitoring the traffic on UDP port 1900 from my laptop while another machine is performing an M-SEARCH. I also have an AV receiver performing an M-SEARCH on the LAN. Wireshark shows these searches going out, and the AV Receiver gets a response from another PC on my network. The search for the Roku device (4200X) doesn't produce a response from the unit, but I do get the NOTIFY messages from it every 20 minutes.
Wireshark shows I'm sending the following:
M-SEARCH * HTTP/1.1\r\n
Host: 239.255.255.250:1900\r\n
Man: "ssdp:discover"\r\n
ST: roku:ecp\r\n
\r\n
Roku software v6.2 Build:3467
Any idea where I can start troubleshooting?