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Thread: Zimbra/Outlook high levels of traffic

  1. #1
    KenVM is offline Active Member
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    Default Zimbra/Outlook high levels of traffic

    Hey folks,

    We have users using Outlook Connector to interface with Zimbra, most of which will leave outlook running in the system tray so they are notified when new mail arrives. Two users seem to be generating a significant amount of traffic while idling, all to our mail server.

    The one I investigated has very little email traffic, just a handful a day and hadn't done anything besides starting up outlook before the problem started.

    Any ideas what might be causing this?

    Thanks,

    -Ken

  2. #2
    sam
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    whats the content of the significant traffic?
    Sam Khavari

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  3. #3
    KenVM is offline Active Member
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    Default Content

    Unfortunately, packet analysis isn't my strong suit.

    Initially there is the https handshake between the two computers.

    After that its almost all traffic going to the mail server, port 443, so the data is encrypted. Ethereal lists the Info for most of these packets as:

    [TCP segment of a reassembled PDU]

    The rest of the traffic is made up of ACK's and the occasional TLS protocol packet which I assume is information that helps reassemble the segments.

    If there is something else I can look for to help, let me know.

  4. #4
    sam
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    reconfigure the connector on that machine to use http instead of https. Then, grab the packets and see whats going on.
    Sam Khavari

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  5. #5
    KenVM is offline Active Member
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    Reconfiguring for http was a bit of an issue for the moment, so I wasn't able to do that.

    Uninstalling the connector and reinstalling from an executable (instead of Active Directory) seems to have fixed the problem for now though.

    -Ken

  6. #6
    azilber is offline Senior Member
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    Default Seeing this as well..

    Quote Originally Posted by KenVM View Post
    Reconfiguring for http was a bit of an issue for the moment, so I wasn't able to do that.

    Uninstalling the connector and reinstalling from an executable (instead of Active Directory) seems to have fixed the problem for now though.

    -Ken
    I'm seeing the same behavior with one of our users as well. We don't have AD here so it might be another issue. There might also be a virus on the person's PC though every antivirus scan and rootkit scan picks up nothing.

  7. #7
    jameswaters is offline Starter Member
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    Default ditto

    We are running into the same issue too. Does anybody have any idea what is going on?

  8. #8
    Klug's Avatar
    Klug is offline Moderator
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    Is it symetric traffic or from Outlook to the server ?
    If asymetric, I might have the same issue since last week...
    Last edited by Klug; 03-28-2007 at 01:44 PM.

  9. #9
    jameswaters is offline Starter Member
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    Quote Originally Posted by Klug View Post
    Is it symetric traffic or from Outlook to the server ?
    I'm not sure, but I do know there is a huge traffic surge when Outlook is running.

  10. #10
    sam
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    The first time you run outlook with ZCO your entire mailbox will be downloaded from the server to the client. After you complete the initial sync, only changes to the mailbox are synchronized between the 2 machines.

    If you get a network trace of the data we can see exactly whats going on.
    Sam Khavari

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