Postfix SMTP hangs, please help!

[RecreH]

Hello:

I have Centos 6.5 with Plesk 11.5.

My postfix SMTP service hangs (users can't send e-mails from Outlook, Mail...). If I reboot server, the service again work well, but in 20 or 24 hours (sometimes before) the SMTP hangs again!!. I tried to restart postfix but it work only some minutes, the only thing that fixes it for a few hours is a reboot.

Please, someone else happens?.

Thanks!!.

 

[IgorG]

Have you tried to troubleshoot it with help of Plesk maillog at least? Any useful and related error messages there? Or, maybe in other logs?

 

[RecreH]

In maillog, last occurs before hangs SMTP service is:

Oct 7 13:58:14 ns305864 postfix/smtpd[2032]: warning: milter unix:/var/spool/postfix/ctmilter/ctmilter.sock: can't read SMFIC_OPTNEG reply packet header: Connection timed out
Oct 7 13:58:14 ns305864 postfix/smtpd[2032]: warning: milter unix:/var/spool/postfix/ctmilter/ctmilter.sock: read error in initial handshake
Oct 7 13:58:14 ns305864 postfix/smtpd[2032]: NOQUEUE: milter-reject: CONNECT from unknown[89.131.80.57]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
Oct 7 13:58:14 ns305864 postfix/smtpd[2032]: NOQUEUE: milter-reject: EHLO from unknown[89.131.80.57]: 451 4.7.1 Service unavailable - try again later; proto=SMTP helo=<C1HUE30H>
Oct 7 13:58:15 ns305864 postfix/smtpd[2032]: NOQUEUE: milter-reject: MAIL from unknown[89.131.80.57]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> proto=ESMTP helo=<C1HUE30H>

And 3 hours later...

Oct 7 16:55:28 ns305864 postfix/smtpd[11686]: connect from unknown[89.131.80.57]
Oct 7 16:55:58 ns305864 postfix/smtpd[11686]: warning: milter unix:/var/spool/postfix/ctmilter/ctmilter.sock: can't read SMFIC_OPTNEG reply packet header: Connection timed out
Oct 7 16:55:58 ns305864 postfix/smtpd[11686]: warning: milter unix:/var/spool/postfix/ctmilter/ctmilter.sock: read error in initial handshake
Oct 7 16:55:58 ns305864 postfix/smtpd[11686]: NOQUEUE: milter-reject: CONNECT from unknown[89.131.80.57]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
Oct 7 16:55:58 ns305864 postfix/smtpd[11686]: NOQUEUE: milter-reject: EHLO from unknown[89.131.80.57]: 451 4.7.1 Service unavailable - try again later; proto=SMTP helo=<RECRESERVER>
Oct 7 16:55:59 ns305864 postfix/smtpd[11686]: lost connection after AUTH from unknown[89.131.80.57]


Can it help you to know the problem?.

Thanks!!.

 

[RecreH]

I have implemented your fix in forum http://forum.parallels.com/showthre...ervice&highlight=read+error+initial+handshake, message #18

I don't know if it work. At the moment all work ok .