Deferred: Broken Pipe - Internal or External problem?

Posted on 2011-10-27
Last Modified: 2012-06-21
Hi All,

Major problem. Several customers experience the same problem: Deferred: Broken Pipe error message when sending email to their own internal Exchange 2007 server. This error occurs when there is an attachment of 1MB or more. They all have Internet from the same ISP, cable (no ADSL). I have learned that this has something to do with an incorrect MTU size. Within all hardware of the company the size is 1500. There is a spamfilter between the outside world and the Exchange server. WITH this spamfilter this error occurs. WITHOUT this spamfilter no problem. The filter itself is not the problem, at 98% of all domain using this filter it works fine.

Here are the tracert's of a working and failing situation:

TracePath Output:
1: (                   0.132ms pmtu 1500
1: (             20.783ms
 2: (                            1.252ms
 3: (              4.006ms
 4: (             asymm  5   1.418ms
 5: ( asymm  6  53.913ms
 6: ( asymm  7   3.423ms pmtu 1456
7: (    17.378ms
 8: (      14.772ms
 9:  no reply
10:  no reply
11:  no reply
12:  no reply

TracePath Output:
1: (                   0.133ms pmtu 1456
1: (              0.901ms
 2: (                            0.710ms
 3: (              2.780ms
 4: (             asymm  5  12.539ms
 5: ( asymm  6   3.027ms
 6: ( asymm  7   3.184ms
 7: (      12.261ms
 8: (    asymm  7  17.523ms
 9:  no reply
10:  no reply
11:  no reply
12:  no reply

Fingers crossed :-)
Question by:ElisysAutomatisering
    LVL 5

    Expert Comment

    It may be something as simple as allowing a larger attachment size on the spam filter.  If you can send email through the spam filter, but not email with attachments I doubt it would be an MTU issue.

    Check the settings on the spam filter for attachment limitations.

    Author Comment

    Hi JamesGolden,

    there are no limitations on the spamfilter and I doubt it will be something simple, unfortunately. Also 98% of all domains in that spamfilter work fine, even with 15MB attachments.
    LVL 19

    Expert Comment

    Can you attach one of the full bounce messages that contain the broken pipe error?  Obviously blot out any sensitive names or IP addresses first.

    Also, if you intentionally send spam to a personal account (as you describe these users doing with attachments) and the spam filter blocks them, does it do so with a different error than "broken pipe", or is it the same?

    Accepted Solution

    Hi Guys,

    eventually it was a new NIC driver which solved the problem, simple as it seems, it took some time to figure this out. Thankx all.

    Author Closing Comment

    Own solution was the right one in this case

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Hire Top Freelancers to Complete Exchange Projects

    Source the talented Expert Exchange community
    for top quality work on your Exchange projects.

    Hire the best. Collaborate easily. Get quality work.

    Get an idea of what you should include in an email disclaimer with these Top 5 email disclaimer tips.
    Set OWA language and time zone in Exchange for individuals, all users or per database.
    In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Organization >> Ad…
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

    779 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    15 Experts available now in Live!

    Get 1:1 Help Now