> if there is an active IPv6 regular (non-loopback) interface with an IPv6 address and network connection, then connection attempts to ::1 seem to hang and timeout
Probably it uses the default route to send packets to ::1, which is deemed not to receive any response.
> I haven't seen any other daemons with issues from this. Maybe they are using IPv4 for loopback?
> if there is an active IPv6 regular (non-loopback) interface with an IPv6 address and network connection, then connection attempts to ::1 seem to hang and timeout
Probably it uses the default route to send packets to ::1, which is deemed not to receive any response.
> I haven't seen any other daemons with issues from this. Maybe they are using IPv4 for loopback?
Probably