10 messages in net.sourceforge.lists.courier-usersRe: [courier-users] Sometimes MTA cra...
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Maik BrauerAug 26, 2007 11:59 pm 
Sam VarshavchikAug 27, 2007 4:00 am 
Maik BrauerAug 27, 2007 5:28 am 
Sam VarshavchikAug 27, 2007 2:39 pm 
Jason BenguerelAug 29, 2007 4:53 am 
Sam VarshavchikAug 29, 2007 3:16 pm 
Maik BrauerAug 29, 2007 11:51 pm 
Sam VarshavchikAug 30, 2007 3:58 am 
Jason BenguerelAug 30, 2007 4:37 am 
Jason BenguerelAug 30, 2007 4:52 am 
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Subject:Re: [courier-users] Sometimes MTA crashs and is not reachableActions...
From:Maik Brauer (mail@mbs-technet.com)
Date:Aug 27, 2007 5:28:52 am
List:net.sourceforge.lists.courier-users

Hi Sam,

OK, to sort out what will cause the problem, I've done the following: --> I've pumped up the memory to 512MB. --> Stand-Alone. Only Courier is running on it with IMAP,IMAP-SSL,MTA,MTA-SSL,AUTHDAEMON

Let's see what is happening. Sam, is there anything else what I can provide you, or what I should configure. Please let me know what I can do else, because it is very important for me to get rid of this issue. I want avoid to set up a new MTA (ex. EXIM, sendmail, etc), because I like the Courier product.

So give me some hints, if I should trace something, tell me. I can setup an separate instance where you can have access to help me to fix that. Because I want support you to get that product stable and that this will help other customers as well to be satisfied with Courier ;-)

Many Thanks.

Cheers, Maik

Sam Varshavchik wrote:

Maik Brauer writes:

After some tests I've observed the following. I tried it with telnet on that port to see if the MTA is responding, with the command (telnet mx01.xxxxxx.com 25) and I can see directly a connection refused. In a Trace file whih a made with TCPDUMP, you can see that after a SYN (Syncronise) Message a RST (Reset) Message will follow. As I said, after a restart, the system is up and running again. This Problem occurs after some hours or maybe 1 or 2 days. So it will take a while if this happens again after a restart. I've installed 2 times as well a complete fresh system, to ensure that I messed up something in the operating system or TCP-Stack. But this has not changed the situtation. So my question, is there a bug

There are no known bugs. It would be rather difficult for any bug to be there in the first place, since the process that listens for an opens new connections is couriertcpd, which does nothing else except that.

in the actuall MTA Software or has someone the same problems,

I don't remember anyone reporting the same problem in the last ten years.

The only thing that I can think of is that you're low on memory. When available memory runs out, some versions of the Linux kernel use the OOM killer to terminate random processes, to free up memory.

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