Very slow sendmail greeting

Barry Margolin barmar at bbnplanet.com
Tue Feb 29 19:33:05 UTC 2000


In article <89h2fp$hf$1 at notrump.whiteoaks.com>,
Morris Jones <mojo at whiteoaks.com> wrote:
>As I was testing our mail relaying, I noticed that sendmail was taking
>a very long time to answer a connect to port 25 with an SMTP greeting,
>about 30 seconds.  This was true on my machine and his.
>
>The obvious culprit is that sendmail is timing out on a DNS lookup,
>but the reverse and forward DNS for my test machine at work is fine
>and has a quick response.  That doesn't seem to be it.  It also has
>the same slow response from his machine to mine and vice versa.

Many sendmails are configured to perform an IDENT query, which means they
try to connect to port 113 of the client machine.  There's a 30-second
timeout on this.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.



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