Roger,
How many seconds did you change your TIME_WAIT to? We changed ours to 60 seconds
after reading this on the Declude list.
We used to have these connection refused issues on our old dual pentium, RAID 5,
single partition machine. But ever since switching to a new dual xeon, 3x RAID 1
machine with 23 granualer partitions, we have elimitated the smtp "connection refused"
problem. It can't be stated enough on this list how important it is to have a good
disk sub system for high volume Imail servers. (thanks Sandy & Len!)
And I do see much less connections listed as TIME_WAIT now after changing that
registry value.
Bill
-----Original Message-----
From: Roger Heath
Sent: Fri, 22 Aug 2003 18:39:06 -0500
Subject: Re: [IMail Forum] Connection refused errors
Reply to: David Clausen
Re: [IMail Forum] Connection refused errors on Friday 5:28:24 PM
This came up on the Declude Virus list thanks to Adrian Hauri.
A> Has anyone of you guys ever had this problem? It could be helpful during the
A> high traffic time that the Sobig Virus causes:
A> http://www.stalker.com/CommuniGatePro/Scalability.html#TimeWait
A> Adrian
We have modified our TCP settings and have seen a big improvement
here. I'd be curious who else might see a difference or know of any
additional settings. This has been a serious problem here and it
was Ipswitch who stated we should change our NIC. Changing the NIC did
nothing but this TCP tweaking has had a positive impact.
--
Roger Heath
[EMAIL PROTECTED]
www.rleeheath.com
----- Copy of Original Message(s): -----
D> Because of the new virus, I have 2 Mail Exchange Postfix servers sitting in
D> front of my v7.15 IMail server collecting about 100k email/day. The MX
D> servers are receiving repeated "Connection refused" errors when trying to
D> forward queued email to Imail periodically during the day. However, I can
D> telnet manually to port 25 without any problems just after receiving the
D> error.
D> Aug 22 18:19:28 mx2 postfix/nqmgr[57580]: B5F2911D98:
D> to=<[EMAIL PROTECTED]>, relay=none, delay=0, status=deferred (connect to
D> mail.domain.com[xx.xxx.xx.xx]: Connection refused)
D> ^Z
D> Suspended
D> mx2# telnet mail.domain.com 25
D> Trying xx.xxx.xx.xx...
D> Connected to mail.domain.com.
D> Escape character is '^]'.
D> 220 mail.domain.com (IMail 7.15 230-14) NT-ESMTP Server X1
D> And then mail will just sit there and queue on the MX servers despite me
D> being able to connect via telnet. I've tried stopping SMTP Service and
D> restarting, but no help. I will also get "server dropped connection without
D> sending the initial greeting" errors sporadically. These machines are
D> sitting next to each other in our Rack, and I am aware of no network issues
D> between them.
D> I'm fresh out of ideas. Thoughts?
D> Dave Clausen
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