Why does HDHR5-2US have port 554 open?

[ronzie9]

I was scanning my LAN with nmap and discovered that my HDHR5-2US has port 554 open. This is usually used for the rtsp protocol. Why is it open?

I apologize if this is not the correct forum to post this question.

[kyl416]

Using curl to access port 554 on my HDHomeRun does return a RTSP server response:

Code: Select all

< RTSP/1.0 200 OK
< SERVER: HDHomeRun/1.0
< CSeq: 1
< Public: OPTIONS, DESCRIBE, SETUP, PLAY, TEARDOWN

I haven't figured out the correct URL format, but I was able get ffmpeg/ffplay to retrieve a SDP response by using rtsp://IPAddress/tuner<n>/whatever

Some of the firmware updates from 2013 and 2014 also mention rtsp

[jasonl]

WMC uses RTSP for streaming from CableCARD devices. Most of the firmware is common across all modern devices, so it's probably just there. AFAIK there's no way to actually tune channels using it, as WMC uses the DRI CAS:SetChannel interface to do that and just uses RTSP for the network part of things.