Hmm, could you please post a full debug log (from --log-file), and the output of this command (with both address families defined in your /etc/hosts): `python -c 'import socket; print(socket.getaddrinfo("mn.h1", None, socket.AF_UNSPEC, socket.SOCK_STREAM))'` -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/tohojo/flent/issues/241#issuecomment-931373985