currently ip:port pairs in frontend (for example, configuration -> hosts) are printed as <ip>: <port>. while it is sort of ok for ipv4, it is not good for ipv6 :

fdbf:b33f:1313:1337:dddd:dddd:1111:13: 10050

standard way to enclose ipv6 address when port is present is to use square brackets like so :

fdbf:b33f:1313:1337:dddd:dddd:1111:13                 <- no port
[fdbf:b33f:1313:1337:dddd:dddd:1111:13]: 10050        <- port present

we could also add a space before the colon both both for ipv4 and ipv6 addresses, making them look like this :

[fdbf:b33f:1313:1337:dddd:dddd:1111:13] : 10050
127.0.0.1 : 10050