Hi, all. This annoying bug can be experienced in 1.7-2.0 servers (while 1.9 has added another bug of high CPU utilization - unrelated to this). In essence, once an external server that we forward internal requests to stops responding for some time and comes back to life a bit later, more often than not haproxy can no longer reach it.

Configuration is very simple

maxconn 16384
nbproc 1
user nobody
group nobody

log /var/run/log local0

    retries 3
    timeout connect 5000
    timeout client 3600000
    timeout server 3600000
    log global
    option log-health-checks

listen amazon_ses
    mode tcp
    no option http-server-close
    default_backend bk_amazon_ses

backend bk_amazon_ses
    mode tcp
    no option http-server-close
    timeout connect 5s
    server amazon email-smtp.us-west-2.amazonaws.com:587 check inter 30s fall 1440 rise 1

That's it. if email-smtp.us-west-2.amazonaws.com:587 fails intermittently and the downtime lasts more than a few 30 sec checks, it can then no longer be accessed via even if the external servers resumes normal operation, and nothing short of a reload (-sf) fixes the problem.

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