Re: RDNS "servfail"

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Thank you for your reply.

No, I am not the ISP, but I have a block of addresses that I use for various
services and sites. The ISP (SBCGlobal) had deligated DNS services to me.

"Anthony [MVP]" wrote:

Todd,
The people operating the reverse zone for your Exchange server external IP
address should be the ISP. That's how the reverse lookup check works.
Because the ISP is authoritative for that group of numbers, it demonstrates
that you are a legitimate user of that IP address.
That does not explain why it seemed to be working before, but its what you
need to do, (unless you are the ISP?)
Anthony,
http://www.airdesk.com

"Todd" <Todd@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:E2B93B3C-1392-46F7-A9BF-239C0C53D9A6@xxxxxxxxxxxxxxxx
After several exchanges with a respondent on the exchange group, we have
come
to a standstill. And the problem is still not solved. DOes anyone here
have
any suggestions what might cause my DNS server not to respond to a RDNS
request?

Thanks for any help that you can offer.

"Todd" wrote:

A respondent on the exchange group suggested I should put this question
here:

Two weeks ago (shortly after some updates from MS) I started having mail
rejected by AOL & CS domains. (This is not the first time I have had this
problem.) But now there is a new twist.

After talking to everyone on the network from my exchange server to AOL's
mail server (AT&T DSL / DNS support and AOL's postmaster) I have
determined
that no one claims to be blocking port 53, but my DNS server is not
responding to RDNS requests from AOL; the request "times out"; it appears
that my server "is not responding to the request" (You may already know
that
unless your server responds to an RDNS request from AOL, your mail will
not
be delivered in the AOL domain.)

Is anyone else seeing this problem? Does anyone have a suggestion as to
how
I can get my server to respond faster? I had been fine for a year (the
last
time I had problems with AOL's postmaster). I have made no recent changes
to
my "public" network. I have made not recent changes to my DSN
configuration.
I am running Exchange 2003 in an SBS 2003 environment with all of the
current
service packs and updates.

Any suggestions would be appreciated.


.

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