SBC v18 for Windows not working with dual IP NIC

[604]

Upgraded from 16.2.24 and neither 18.0.30 nor 18.1.34 beta will work. Log shows this:

CRIT | 20220116-084558.966 | 3CX | SBC | 9096 | Log.cpp:158 | ====================== 3CX SmartSBC 18.0.30 @ server.local ======================
CRIT | 20220116-084558.966 | 3CX | SBC | 9096 | Log.cpp:159 | Log started: type = file, level = ERR, size = 104857600, resip = ERR, remote = -1
CRIT | 20220116-084558.966 | 3CX | SBC | 9096 | Bridge.cpp:28 | System Clock: resolution 0 microseconds, not monotonic
ERR | 20220116-084558.982 | 3CX | SBC | 9096 | UdpMulticast.h:55 | Failed to join interface 192.168.120.8 to multicast SIP group, error(10022):
CRIT | 20220116-084558.998 | 3CX | SBC | 9096 | RPiTunnel.cpp:373 | Running in console mode

The server is a Hyper-V VM running 2012 R2. vNIC is dual ip 192.168.120.8 and 192.168.120.2. When I remove the 2nd IP, the SBC works and all phones can register. When I readd the 2nd IP and restart the service, it shows the same error above.
I reverted back to 16.2.24 and now it won't work either..
Workaround was to add a 2nd vNIC with .2 address, and now it seems to bind correctly. Not sure why this broke after updating to v18 but I thought I should report this.

 

[Evolute IT]

Why would you have 2 IPs for the SBC?

 

[Saqqara]

Sbc server is designed to only work with one network card, one ip address