pop3 timeout problems.

From: Etienne Ledoux (etienne_at_unix.za.org)
Date: 11/20/03

  • Next message: Chris Cook: "script to change user's group?" 
    To: freebsd-isp@freebsd.org
Date: Thu, 20 Nov 2003 12:23:35 +0200

    Greetings,

    I've recently changed/upgraded our mailserver to a new enviroment.
    I'm using postfix, courier-imap on my mailservers and I keep the mailboxes on
    a shared nfs drive. Since the move we have been having a few complaints about
    timeouts while downloading mail via pop3.

    These timeouts would occur on small and large mailboxes, with only a few
    messages in them. The client has a diginet line which isn't saturated. The
    connection would start out ok and then it just slows down to a grinding halt
    and eventually times out. One thing we have noticed is that all the
    complaints are coming from users using Windows XP. We have tested downloading
    from the same windows xp machine using outlook and outlook express and the
    same thing would happen. But if we downloaded the same mailbox from a
    different machine using windows 98 on the same lan using the same diginet
    connection the mail downloads quickly without a problem (we also tried
    different network cables). We have other clients experiancing the exact same
    problem and they are also windows xp users on diginet lines.

    I mount the nfs share from my bsd boxes using the -r=8192,-w=8192 option.

    The servers are handling allot of mail daily but aren't under extreme heavy
    load.

    I haven't tried lowering the MTU and I haven't tried another pop3 server yet.
    But this will be my next steps to try and solve the problem.

    Could this be a problem with windows xp (why wasn't it a problem before I did
    the move ?)

    What could be causing this ?
    Any ideas, suggestions ?
    What can I do to try and fix this.

    tx.
    e.
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