Re: E2K SMTP virtual server mailflow slow

From: Rich Matheisen [MVP] (richnews_at_rmcons.com.NOSPAM.COM)
Date: 05/05/04 

Date: Tue, 04 May 2004 20:43:49 -0400

"Joe Mancuso" <jmancuso@umaryland.edu.NO-SPAM> wrote:

>The default SMTP virtual server on my Exchange 2K with SP3 has been in operation for many months now. Recently, messages for external domains will suddenly begin to queue up. Eventually messages will begin to trickle out to their intended destination. Then again suddenly, message flow will return to normal and be delivered without delay.
>
>During times of delay, if I telnet to port 25 of one of the systems trying to be contacted, the connection will fail. If I do it again, it will work. When I raise the EXCHANGE TRANSPORT values to MAX, I'll sometimes receive an Event ID: 4000 with the message "connection dropped by the remote host."
>
>I've looked everywhere on the net and still can not seem to get a handle on what is causing this intermittent issue. Thoughts?

Router, switch, NIC, port, cable, carrier, ISP, or the other servers.
There's a long list of items between your server and the other one.
Don't forget MTU sizes, packet fragmentation, etc. 

-- 
Rich Matheisen
MCSE+I, Exchange MVP
MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm

Relevant Pages

  • Re: Help In network configuration.
    ... port of a router. ... 2] I will run a cable from Internal Port of router to the ... external port of firewall. ... Servers Switch. ...
    (microsoft.public.win2000.networking)
  • Re: probably an easy routing question, so please help
    ... plugged into the same gigabit switch as Server B in Block 2 and they ... from a 10Mb link to the router and the computers are both hooked into ... not run out the 10Mb port to the router with all of its traffic, ... nodes in the two networks you don't own. ...
    (comp.dcom.sys.cisco)
  • Re: Switch Questions
    ... >:I manage a small network (75 desktops, 4 servers) with a single HP ... >:Procurve 4000m switch which has one 1-port gigabit module and the other ... >:with dual gigabit NICS. ... Obvioulsy, with only one gigabit port, I can ...
    (comp.dcom.lans.ethernet)
  • Re: Switch Questions
    ... :I manage a small network (75 desktops, 4 servers) with a single HP ... :Procurve 4000m switch which has one 1-port gigabit module and the other ... :with dual gigabit NICS. ... Obvioulsy, with only one gigabit port, I can ...
    (comp.dcom.lans.ethernet)
  • Re: Help Me Open Port 81!
    ... when I designate domain2.net as port 81 ... Your router is assigned a public IP address by your provider. ... Somewhere behind your router are two servers with private IP addresses ... the browser connects to that address port 80/tcp (the default ...
    (comp.security.firewalls)