Poking at this a bit it appears that epmd will bind everywhere by default, specific IPv6 addresses but not specific IPv4 addresses; so by enabling IPv6 support, we've broken anyone who's a) disabled IPv6 or b) trying to limit access to a single IPv4 address.
Poking at this a bit it appears that epmd will bind everywhere by default, specific IPv6 addresses but not specific IPv4 addresses; so by enabling IPv6 support, we've broken anyone who's a) disabled IPv6 or b) trying to limit access to a single IPv4 address.