Harmony hub won't pair with version 5.0

[politby]

Today I upgraded to v5.0 and started with a clean slate on a Debian 9 VM. Everything works fine except that my Harmony won't pair with the ha-bridge. There is nothing in the log that there are any requests coming in from the harmony. The app says it has found a Hue brdige and asks to press the button like others have reported. I have tried the "search for Hunter device" workaround but that doesn't help.

The only thing showing in the log is

2017-12-01 16:34:02,435 [main] INFO com.bwssystems.HABridge.upnp.UpnpListener - Traceupnp: SSDP M-SEARCH packet from 192.168.2.2:50255 2017-12-01 16:34:02,435 [main] INFO com.bwssystems.HABridge.upnp.UpnpListener - Traceupnp: send upnp discovery template 1 with response address: 192.168.2.2:80 to address: /192.168.2.2:50255 2017-12-01 16:34:02,436 [main] INFO com.bwssystems.HABridge.upnp.UpnpListener - Traceupnp: send upnp discovery template 2 with response address: 192.168.2.2:80 to address: /192.168.2.2:50255 2017-12-01 16:34:02,437 [main] INFO com.bwssystems.HABridge.upnp.UpnpListener - Traceupnp: send upnp discovery template 3 with response address: 192.168.2.2:80 to address: /192.168.2.2:50255
(.2 is the ha-bridge IP). Nothing from the Harmony hub which is .73.

I can't seem to be able to change the logging level. When I change to e.g. "trace" and click on "update logging levels" I get a green confirmation box but then it reverts back to "info".

It's running on port 80, IP address is that of the local machine and the UPnP port is 5000. My Amazon Echo had no problem pairing. My "real" Hue bridge had no problem pairing with the Harmony.

My router (Sophos XG) doesn't support UPnP but I don't see why it would be involved since we're on a LAN.

No firewall or anything. Any ideas?

[politby]

identical to #797