Using brackets with the IP, I get:
Failed to connect: Could not resolve host ‘[2601’
Using no brackets I get:
Failed to connect: The socket is not connected
Using a fqdn in the linux host file, I get:
Failed to connect: Could not resolve host ‘train.internal.saroza-webb.com’
Using real DNS with a AAAA record, I get this:
Failed to connect: Could not resolve host ‘train.saroza-webb.com’