[erlang-questions] Frequent eaddrnotavail in httpc

[Behrad]

I randomly receive eaddrnotavail (and some socket_closed_remotely) when
connecting to a remote CouchDB in a high concurrency of processing some
events in my erlang process. Since there are many other http connections
between my process and nodejs and redis services on the same local machine,
I've increased OS's local_port_range and ERL_MAX_PORTS but still got that
error.
When getting the error, retrying the http request gets OK.

Any other OS or Erlang specific tuning? or what?
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