"address family mismatch" on init_process_group

[yohan-pg]

When opening a connection withinit_process_group from a local (Mac) host a remote (Ubuntu) host, I get the following error on the remote host, which closes the connection:

RuntimeError: [/pytorch/third_party/gloo/gloo/transport/tcp/pair.cc:210] address family mismatch

I only specified the (same) IPv4 address on both hosts, and interestingly the problem doesn't occur when running from a local Ubuntu machine (tested from within a docker).