How to fix rygel upnp service discovery?

Question

I'm trying to use Rygel as a dlna/upnp server and renderer on a ubuntu laptop. It is not able to see anything on the network, and no other dlna software discovers it. There are other working dlna / upnp devices so I believe I can rule out the router.

Running in debug mode at the command line like this:

G_MESSAGES_DEBUG=all rygel -g 5

there are lines containing messages like this:

New network MY_SSID (wlp4s0) context available. IP: 192.168.8.127

which is the correct network, wifi card and ip address

In the config file the network setting is:

interface=

output from lsof filtering for my lan

lsof -i -P -n | grep 192.168.8| grep rygel

returns

rygel     25313           barry   14u  IPv4 25790052      0t0  UDP 192.168.8.127:1900 
rygel     25313           barry   16u  IPv4 25790055      0t0  UDP 192.168.8.127:37931 
rygel     25313           barry   44u  IPv4 25790056      0t0  TCP 192.168.8.127:41671 (LISTEN)

If I run another local client then it will show up on the that, so only localhost discovery works.

I have tried setting the network device to the network card in use, but it made no difference. I have not changed any other rygel config settings.