Homegear not found on same Machine as openHAB 2.4 - Is there a limitation on localhost?

Hello everyone.

My Setup on a Virtual Machine (VM) on debian 9.8 with openhabian and openHAB 2.4 was unable to found a Homegear-Installation on the same VM. I`ve tried to install Homegear on a second VM in the same Network --> was found on PaperUI - on the other hand: openHAB on the second VM was able to find homegear on the first VM.
Is there a Limitation on Network on the same VM?

Also manually added Thing with Addresses like: localhost, 127.0.0.1, LOCAL_IP_ADDRESS - but with no luck.
Output of ifconfig

ens3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.x.x netmask 255.255.255.0 broadcast 192.168.x.255
inet6 XXX prefixlen 64 scopeid 0x0
inet6 XXX prefixlen 64 scopeid 0x0
inet6 XXX prefixlen 64 scopeid 0x20
ether XXX txqueuelen 1000 (Ethernet)
RX packets 280999 bytes 25882483 (24.6 MiB)
RX errors 0 dropped 10 overruns 0 frame 0
TX packets 98390 bytes 9172937 (8.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10
loop txqueuelen 1 (Lokale Schleife)
RX packets 11610 bytes 1061308 (1.0 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11610 bytes 1061308 (1.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

BTW: Network Binding does not found any pingable device.
Thanks for any hint.

There is a bug in the Network binding in 2.4 that broke automatic discovery. It has been fixed in the snapshots, perhaps even 2.5 M1.

You need to be a little more clear in your use of the term “host” when VMs are involved.

The “host” is your physical hardware. So are you running Homegear in another VM on the same host? Are you running Homegear in the same VM as OH?

Yes, you´re right.

Homegear was installed on the same VM as OH with openhabian-config. The Host was a QNAP NAS with bridged Network - so every VM get his own IP from DHCP-Server.

Every other Homegear-Installation was found with auto discover. In another VM, Docker Container, Raspi,…

In Homegear i have tried to use IP v4 only in rpcservers.conf

#interface = ::1
interface = 0.0.0.0

It does not help.