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421 Too many concurrent SMTP connections

Discussion in 'E-mail Discussions' started by Hostbox.be, Nov 26, 2007.

  1. Hostbox.be

    Hostbox.be Well-Known Member

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    Hi all

    On one specific server, my clients are getting often following message when sending emails:

    421 Too many concurrent SMTP connections

    Also I get almopst every hour a meesage from the server: "exim failed"

    I already set smtp_accept_max = 200 (default is 100), but no solution.


    When I look for IP's connecting to port 25:

    Code:
    netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
    I see a lot of IP's with 1 or 2 connections to my server, so that seems normal, but at the end of the list I see many connections from my 2 DNS servers and from 127.0.0.1

    The 127.0.0.1 is normal I think because this is also listed on all my other servers, but not from my 2 DNS servers that are configured in /etc/resolv.conf

    These last two are eating up all SMTP connections, does someone know a solution for this ?


    Linux CentOS 4
    WHM 11.2.0
    cPanel 11.11.0-S18033
    exim-4.63-1
     
  2. bazzi

    bazzi Well-Known Member

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    Do you have a program that is reporting something from that servers to your by email?
     
  3. bazzi

    bazzi Well-Known Member

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