Re: Mail delivery wierdness

keith_at_smmc.qld.edu.au
Date: 07/22/03

  • Next message: karl agee: "X 4.3 on thinkpad iSeries 1300" 
    Date: Tue, 22 Jul 2003 13:10:54 +1000 (EST)
To: <ryan@sasknow.com>

    Hi Ryan...

    Yep I can confirm it was NOT listening on :25
    The techie on the ground swore black & blue it was (always follow what you
    know!). I figured it wasn't but maybe it was somethjing I didn't
    understand?? He changed the config on exchange and voila! Now I can chat
    with smtp on the mail server from outside!
    Next question.
    Squid is also on the gateway/firewall.
    Mail is still not being delivered.
    Can I assume if I can chat via telnet to the exchange server : 25 Then
    mail can also get thru? Surely that means a persistent session is set up
    and mail should also get to it. It isn't being delivered to mailboxes
    there so what the???
    Any ideas?
    Thanks Keith

    > keith@smmc.qld.edu.au wrote to Free bsd :
    >
    >> Hi all,
    >> I am trying to connect to an exchange server via my new gateway
    >> ipfilter fbsd 4.7 ipnat firewall.
    >> Telnetting to the server inside to port 25 reveals...
    >>
    >> Connected to 203.44.yyy.xx
    >> Escape character is ']'.
    >> Connection closed by foreign host.
    >>
    >> Why would it close instantly?
    >
    > That's usually the behaviour indicating that there is a server at
    > 203.44.yyy.xx, but there is no service listening on port 25. (Or, maybe
    > your fancy ipfilter firewall is simulating the equivalent).
    >
    > The first thing you should do is confirm that the server in question
    > *is* actually listening on port 25. MS Exchange is pretty far beyond the
    > charter of this list, but general network techniques would still apply:
    >
    > Try the same telnet test using the win32 telnet on the server itself.
    > (i.e., telnet localhost:25, and try it by the public IP in case Exchange
    > isn't listening on localhost for some reason). If it won't talk SMTP
    > with you in either case, you won't get any farther. On the other hand,
    > if the test is successful, try the same thing from the next hop (your
    > FreeBSD gateway?).
    >
    > If you isolate the problem to the gateway (and/or every host directly
    > connected to the other side of your gateway), you'd probably do well to
    > forward your firewall rules and ipnat config to the list (as well as a
    > description of what you're trying to accomplish with your config), in
    > which case we'll be able to give you better specific instructions.
    >
    >> Does this reveal while I can't send mail to any email account on it?
    >> Is this an exchange hassle? Is port 25 to be only tcp or udp as well.
    >
    > SMTP is a connection-oriented service. SMTP can, in theory, be used
    > over transport layers other than TCP, but SMTP over UDP would require a
    > fair hack to SMTP to implement. So, the short answer is, forget about
    > UDP. :-)
    >
    > - Ryan
    >
    > --
    > Ryan Thompson <ryan@sasknow.com>
    >
    > SaskNow Technologies - http://www.sasknow.com
    > 901-1st Avenue North - Saskatoon, SK - S7K 1Y4
    >
    > Tel: 306-664-3600 Fax: 306-244-7037 Saskatoon
    > Toll-Free: 877-727-5669 (877-SASKNOW) North America
    >
    >
    > _______________________________________________
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  • Next message: karl agee: "X 4.3 on thinkpad iSeries 1300"

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