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Postfix with "Error: timeout exceeded"

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  • Nguyen Nang. Thang
    Hi everyone, I have deployed ASSP to improve Anti-Spam feature for our mail systems (running Zimbra). I have an issue related to SMTP connections between ASSP
    Message 1 of 2 , Jul 25 9:47 PM
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      Hi everyone,

      I have deployed ASSP to improve Anti-Spam feature for our mail systems (running Zimbra). I have an issue related to SMTP connections between ASSP and Zimbra's Postfix.

      After receiving EHLO command from one host running ASSP, another host running Postfix cannot continue to connect to ASSP to get more SMTP commands (the connection is disconnect
      ed).

      Here is our system topology:
      Internet -> SMTP Proxy Server (ASSP) -> SMTP Server (Zimbra) -> Mail Server (Zimbra)

      Here is the content of /var/log/mail.log file:
      Jun 28 09:55:33 mail postfix/smtpd[19834]: smtp_get: timeout
      Jun 28 09:55:33 mail postfix/smtpd[19834]: > unknown[192.168.100.11]: 421 4.4.2 mail.test.com Error: timeout exceeded
      Jun 28 09:55:33 mail postfix/smtpd[19834]: match_hostname: unknown ~? 127.0.0.0/8
      Jun 28 09:55:33 mail postfix/smtpd[19834]: match_hostaddr: 192.168.100.11 ~? 127.0.0.0/8
      Jun 28 09:55:33 mail postfix/smtpd[19834]: match_hostname: unknown ~? 192.168.100.0/24
      Jun 28 09:55:33 mail postfix/smtpd[19834]: match_hostaddr: 192.168.100.11 ~? 192.168.100.0/24
      Jun 28 09:55:33 mail postfix/smtpd[19834]: timeout after EHLO from unknown[192.168.100.11]
      Jun 28 09:55:33 mail postfix/smtpd[19834]: abort all milters
      Jun 28 09:55:33 mail postfix/smtpd[19834]: milter8_abort: abort milter inet:127.0.0.1:8092
      Jun 28 09:55:33 mail postfix/smtpd[19834]: disconnect event to all milters
      Jun 28 09:55:33 mail postfix/smtpd[19834]: milter8_disc_event: quit milter inet:127.0.0.1:8092
      Jun 28 09:55:33 mail postfix/smtpd[19834]: disconnect from unknown[192.168.100.11]

      P.S. I researched another cases to test SMTP connections between ASSP and Postfix/Sendmail, they worked perfectly.

      Thanks for your help.

      Regards,
      N. Thang
    • Wietse Venema
      ... You need to look up the earlier logfile record for postfix/smtpd[19834]. That information will show how long Postfix has waited after receiving the EHLO
      Message 2 of 2 , Jul 26 5:01 AM
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        Nguyen Nang. Thang:
        > After receiving EHLO command from one host running ASSP, another
        > host running Postfix cannot continue to connect to ASSP to get
        > more SMTP commands (the connection is disconnect
        > ed).
        >
        > Here is our system topology:
        > Internet -> SMTP Proxy Server (ASSP) -> SMTP Server (Zimbra) -> Mail Server (Zimbra)
        >
        > Here is the content of /var/log/mail.log file:
        > Jun 28 09:55:33 mail postfix/smtpd[19834]: smtp_get: timeout
        > Jun 28 09:55:33 mail postfix/smtpd[19834]: > unknown[192.168.100.11]: 421 4.4.2 mail.test.com Error: timeout exceeded
        > Jun 28 09:55:33 mail postfix/smtpd[19834]: timeout after EHLO from unknown[192.168.100.11]

        You need to look up the earlier logfile record for postfix/smtpd[19834].

        That information will show how long Postfix has waited after receiving
        the EHLO command from ASSP.

        Then, you know if Postfix times out too soon, or if ASSP is too
        slow.

        Wietse
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