Re: Data timeout from MS Exchange

From: Victor Duchovni (no email)
Date: Mon Nov 21 2005 - 12:03:13 EST

  • Next message: L. Mark Stone: "Re: Recommended RBL Lists? (Perhaps Slightly OT)"

    On Sun, Nov 20, 2005 at 10:34:54PM -0500, wrote:

    > >< unknown[]: MAIL FROM:<> SIZE=3116
    > >> unknown[]: 250 Ok
    > >< unknown[]: RCPT TO:<>
    > >> unknown[]: 250 Ok
    > >< unknown[]: DATA
    > >> unknown[]: 354 End data with <CR><LF>.<CR><LF>
    > >> unknown[]: 421 xxx.xxxxxxxx.xx Error: timeout exceeded
    > >
    > >And:
    > >: timeout after DATA from unknown[]
    > >
    > >I have googled now for about 2 days, trying a lot of crazy things but
    > >things just dont seem to work.
    > Situation 1) Symantec Antivirus is installed on the exchange server.
    > There is some kind of proxy SARC was using to intercept all the SMTP
    > traffic. Solution was to disable the Symantec Proxy software.
    > [...]

    Probable Cause 0) IP Path MTU discovery problems.
    Probable Cause 0.5) Broken Client TLS implementation.

    To tell these apart, the OP should disable TLS on the server, and if
    that fixes the problem it is TLS and not the MTU that is at issue.

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