Great Circle Associates Majordomo-Users
(March 1997)

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Subject: Re: Index of error messages
From: Rich Pieri <rich . pieri @ prescienttech . com>
Date: 10 Mar 1997 14:05:40 -0500
To: majordomo-users @ greatcircle . com
In-reply-to: Brian Christensen's message of Mon, 10 Mar 1997 11:34:02 -0700
References: <>


>>>>> "BC" == Brian Christensen <> writes:

BC> Is there a comprehensive listing anywhere describing causes and
BC> solutions to error messages of the following format:

Um, no, because these problems are for the most part totally unrelated to
each other, and there is generally nothing that you as a list or Majordomo
administrator can do about any them.  But, just so you know...

BC> 420 TCP read error

Probably due to an overloaded but not throttled network.  The initial
connection was made but the transaction was not completed.

BC> 450 MX lookup failure

Could not find the MX (Mail eXchanger) DNS record for the target host.

BC> 450 Host down

Obvious, I think.

BC> 451 System Problem

Not so obvious; could be any of a large list of problems... I mean a
tremendously large list.

BC> 550 Host unknown

Another DNS issue, this time the IP address of the target host could not be
retrieved.  This and the MX lookup failure are related in that there are a
number of reasons for the failure ranging from network lossage to bogus DNS

Version: 2.6.3a
Charset: noconv

Rich Pieri <> | Do not use Happy Fun Ball on
Prescient Technologies, Inc.              | concrete.
A Stone & Webster Company                 | 
I speak for myself, not PTI or SWEC       | 

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