Also due to the ambiguity of ports also using a colon delimiter, the IPv6 address may be in brackets: [::1:2:0:0:dead:beef]:443 And link-local addresses a

Also due to the ambiguity of ports also using a colon delimiter, the IPv6 address may be in brackets: [::1:2:0:0:dead:beef]:443 And link-local addresses are mandatory and scoped per interface, so they need a zone id supplied as either an integer or interface name: fe80::1:2:0:0:dead:beef%eth0