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pop on serverXX.mydomain.com failed

Discussion in 'General Discussion' started by flashweb, Oct 24, 2007.

  1. flashweb

    flashweb Well-Known Member

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    Hi,

    On one of my cpanel server, i get following message many times a day


    Server is not under load. Most of the time, it is less than 1, dual cpu opteron 248 cpu.

    On /var/log/chkservd.log

    I found



    What log i should check next to find the problem for this ? I tried cpanel upgrade, but still getting this error.

    Thanks,

    Yujin
     
  2. fabianska

    fabianska Registered

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    haved solutions??

    i have the same trouble, any help are been received...

    thank!!!
     
  3. flashweb

    flashweb Well-Known Member

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    Not yet find a solution for the problem, it still happens on my server.
     
  4. felatio

    felatio Registered

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    Same problem here ... any ideas ???? Anyone ... ???

    I have 6 cpanel servers and its only happening on one of them , load in under 1 everytime , could it be something oveloading the popd daemon ?
     
  5. nocbr.com

    nocbr.com Member

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    same problem here too. Anyone have a solution?
     
  6. flashweb

    flashweb Well-Known Member

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    My problem solved with out doing anything. I used to get such mails for about one month, now i don't get such mails, seems cpanel auto fixed it.

    So wait for that happen :D
     
  7. feijao

    feijao Member

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    We have the same problem on at least 2 servers.
    The server load average is low (1 or 2).

    Did anyone got it fixed?
     
  8. sehh

    sehh Well-Known Member

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    this happens because the pop server is busy when the service check is performed by "chkservd".

    "chkservd" works by connecting to the pop3 port, if it can't connect it thinks that the pop3 daemon is dead and so it restarts it.

    this may look "ok" at first glance, but its wrong and a truly bad implementation on behalf of the cPanel developers.

    why? simply because there is a change (on some servers it happens rather frequently) that the pop3 server will be working normally but have reached the maximum connection limit. Thus, any extra connections will be dropped, including the service check performed by "chkservd".

    this happens on all the processes as far as i know (pop3/imapd/ftp/etc)

    for example, if you check your FTP logs you'll see something like:
    (?@127.0.0.1) [INFO] New connection from 127.0.0.1
    (?@127.0.0.1) [INFO] Logout.

    thats the "chkservd" daemon doing a silly connection, which of course can lead the problem i described above on a busy server and which results in the entire process being restarted.

    unless the cPanel developers find a better way to check if a process is alive or dead, the only solution to the problem is to raise the connection limits for those processes (pop3/imap can be done via the WHM).

    just make sure you don't raise them too high else you'll be a target for DoS attacks when some attacker does a brute force attack on you.
     
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