Re: smtp unable to connect to dns server

Tech-Archive recommends: Fix windows errors by optimizing your registry

From: Darin Roulston [MSFT] (darinr_at_online.microsoft.com)
Date: 02/25/04 

Date: Wed, 25 Feb 2004 13:22:12 -0600

To ensure that DNS is really the only problem you can setup an smtp
connector for a certain domain (i.e. yahoo.com in the address space tab) and
on the General tab point to yahoo's smtp server (which you got when doing an
mx record for yahoo.com with nslookup). If the mail gets delivered then DNS
is probably you're only problem. One possibility is that Windows 2000 SMTP
and consequently Exchange 2000 SMTP uses TCP to query DNS instead of UDP
which is the default when you use nslookup. Firewalls sometimes block TCP
requests over port 53 or some DNS servers don't listen on the TCP port. You
can follow http://support.microsoft.com/default.aspx?scid=KB;EN-US;263237
to have nslookup use TCP instead UDP to see if that is the case. 

-- 
Darin Roulston
Microsoft PSS
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This posting is provided "AS IS" with no warranties, and confers no rights
"stephen hall" <shsc21441@blueyonder.co.uk> wrote in message
news:eC50M5o8DHA.3880@TK2MSFTNGP11.phx.gbl...
> I cannot figure how to rectify this. I cannot send mail to external
> addresses.
>
> I have done ns lookup, telnet (helo, q=mx, q=soa, ping), configured the
smtp
> vs (anonymous), forward & reverse lookup, Users and Group.
>
> What am I missing?
>
> Event.id 4000 smtpsvc is non-existent for this.
>
> Could it be local policy or routing?
>
>

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