Desktop client can't connect to self-hosted instances with DNS that resolves to private IPs

Tried to connect to my self-hosted instance with Fluxer Canary, and almost immediately see "Couldn't connect to [hostname]. Try again." Expected to be able to log in.

1. Set up a self-hosted instance.
2. Set up your DNS such that it resolves to a private IP address (this is a relatively common use case for routers that don't support hairpin NAT).
3. Try to connect to it using Fluxer Canary with support for self-hosted instances.
4. See the issue above.

Note: As soon as the DNS resolves to a public IP, if your router supports hairpin NAT, you can restart Fluxer Canary and connect.