Re: Slow connect to SMTP

Bill Wesson wrote:

> I’m getting some latency with the connect to our SMTP SENDMAIL server
> on Fedora Core 1 that I can’t figure out.
>
> User’s email hangs in the outbox for 5-10 seconds before sending starts.
>
> So I started telnet-ing (on port 25) to our Sendmail-8.12.11-1 server.
> (Upgrading to Sendmail 8.13 is not possible presently, nor is another
> SMTP handler.) Sure enough, it took a good a good 5 seconds to send
> back the SMTP connect banner.
>
> I got an instant banner telnet-ing to pop3 on the same server.
>
> The SMTP/POP3 server is in the DMZ and I’m testing from our LAN. If
> the travel through the firewall is the issue, then why would pop3
> banner up instantly?
>
> Our server is at mail.imarcengraver.com. Try it. Let me know è telnet
> mail.imarcengraver.com 25 – do you get latency?
>
> From our LAN and through the same firewall, I can telnet port 25 to an
> external host ‘mail1.thenoc.com’ and get an instant banner.
>
> Turning on AUTH (port 113) between DMZ and LAN made no difference.
>
> At the server console a telnet to 127.0.0.1 25 yields an instant banner.
>
> Later today, I’m going to start sniffing packets at the mail server.
> Anybody have any ideas before I start down this road?
>
> Thanks,
>
> --Bill
>
I tried it and got an immediate connection with a banner.



Jim

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