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Re: Lots of connections from Unknown

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  • Wietse Venema
    ... The fix is to configure the tool to send QUIT before hanging up. The lost connection after connect from unknown[unknown] requires attention when
    Message 1 of 4 , Mar 16 9:56 AM
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      Manuel Mely:
      > Do you have a monitoring tool in your network? Maybe it's a Nagios testing
      > your smtp server.
      > That also happens to me in my loadbalancer, keepalived test smtp port
      > with a telnet and then disconnects and i have a lot of this message in
      > my logs too.
      >
      > Is there a way to avoid this?

      The fix is to configure the tool to send QUIT<CR><LF> before hanging
      up.

      The "lost connection after connect from unknown[unknown]" requires
      attention when it happens frequently; it means that traffic exceeds
      the server capacity.

      Wietse

      > PS: It's not for spam.
      >
      >
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