connection
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... domain;
o connection to the designated remote server otherwise fails -- the
specifics terms of which are defined when an application protocol
...
...
For example, if the client gets a "connection refused" message from a
server, should it retry for some (protocol-dependent) period of time?
Or should it try the next-preferred target ...
... host-port pair did not work
(connection refused, application-level error), the client is expected
...