Sounds like it could be a multicast problem. I have had similar with a
Broadcom Wifi chipset whose drivers don't properly do multicast.

I realise this is an old bug, I didn't check for historical ones last time I 
tidied up this package,  but in case I can still help -
 
- first thing to check, have you set up your multicast interface correctly ?  
If you are running libupnp as part of a server so that it can advertise itself, 
then you need to do this. You should have a route to 239.0.0.0/8, or possibly 
224.0.0/4.  Do "sudo ip route ls" to check.  (If you use multicast in your 
network for purposes other than service discovery then you will need both, in 
this case give me more details).

- second thing to check - is it a problem with your network adaptor's
multicast handling ?  Some WLAN cards, for instance, don't support
multicast unless placed into promiscuous mode.  Check this by repeating
your wireshark test but make sure "promiscuous mode" is unticked in the
interface selection dialogue.  If this *doesn't* cause libupnp to
detectyour devices then you need to look into your network drivers

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https://bugs.launchpad.net/bugs/420590

Title:
  UPNP does not start correctly

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