Running on a virtual machine with NAT and port forward the backend crashes on start

[rchakode]

Traceback (most recent call last):
File "./backend.py", line 764, in
waitress_serve(wsgi_dispatcher, listen='*:5483')
File "/usr/local/lib/python3.6/dist-packages/waitress/init.py", line 12, in serve
server = _server(app, **kw)
File "/usr/local/lib/python3.6/dist-packages/waitress/server.py", line 88, in create_server
sockinfo=sockinfo,
File "/usr/local/lib/python3.6/dist-packages/waitress/server.py", line 232, in init
self.create_socket(self.family, self.socktype)
File "/usr/local/lib/python3.6/dist-packages/waitress/wasyncore.py", line 354, in create_socket
sock = socket.socket(family, type)
File "/usr/lib/python3.6/socket.py", line 144, in init
_socket.socket.init(self, family, type, proto, fileno)
OSError: [Errno 97] Address family not supported by protocol
La configuration réseau de ma VM était NAT + redirection de ports VM - Hôte(22 -> 2222, 80 -> 8080).