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Conference forty2::mailbus_400

Title:MAILBUS 400 User Forum
Notice:kits 100-109 - Infocenter //www.digital.com/info/messaging
Moderator:IOSG::MARSHALL
Created:Thu Jun 11 1992
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3210
Total number of notes:9174

3119.0. ""Routing attempts limit reached" event" by ZUR01::ASHG (Grahame Ash @RLE) Mon Jan 27 1997 10:10

Customer reports that he's seen an Invalid MPDU Event

       Reason                            = Unable to Transfer
       Diagnostic                        = Invalid Arguments
       Supplementary Information         = "Routing attempts limit reached.
(124)"

This was provoked by sending a message to an address of the form:

c=c;a=a;p=p;o=o;ou1=ou1;g=g;s=s

Note, Personal Name, and only 1 OU term. But the user's actual O/R addr has 2 
OUs, so they use receipient redirection to route it to the real address which 
is:

c=c;a=a;p=p;o=o;ou1=ou1;ou2=ou2;g=g;s=s

This entry has the Routing Instruction (transfer to peer mta domain), and the 
content info. This is a standard practice at this site, and it usually works. 
In fact, when I tried it this morning, it worked as well!

The question is "What could be the probable cause of the event?"

Thanks,

grahame
T.RTitleUserPersonal
Name		DateLines
3119.1Possibly misled by event's text?ZUR01::ASHGGrahame Ash @RLEMon Jan 27 1997 12:1714
The AltaVista Notes search utility found 2 more notes with this event in - 
2524, 2663. In both cases it was associated with problems with peer MTAs i.e. 
the MTA had tried to send the message, and failed.

I think I was confused by the use of the word "Routing" in the event. I've 
always associated this with the MTA attempting to determine the eventual 
route from the MTS info - following redirections etc. It seems that the 
redirection here may well be irrelevant to the problem. It may have been 
clearer if the events said "Sending" or "Relaying" instead. Just an opinion.

Meanwhile, I'll ask the customer to check for other events previous to this 
one.

grahame
3119.2Doesn't appear to be the networkZUR01::ASHGGrahame Ash @RLEMon Jan 27 1997 15:0512
Having looked through a few recent event files, it seems that:

 - this event occurs every day, several times, for different recipients and 
domains

 - it is not generally preceded by evidence of a network problem.

Any other theory?

Thanks,

grahame
3119.3More info, no closerZUR01::ASHGGrahame Ash @RLETue Jan 28 1997 11:5122
I've now looked at a whole day's event file and gathered some more info - 
which doen't help me at all!

There are 3 similar Invalid MPDU events:

 - Transfer Attempts limit reached
	This occurred after peer mta events showed connection problems

 - Delivery Attempts limit reached
	This occurred after the SMTP Gateway had failed on 4 attempts 
(Internal Error) at fetching a message

 - Routing attempts limit reached
	This is the problem one, and it appears out of the blue. I've also now 
discovered that it can happen for addresses which are not redirected.

I'd appreciate any explanation of why the MTA would issue this particular 
event.

Thanks,

grahame
3119.4ZUR01::ASHGGrahame Ash @RLETue Feb 04 1997 13:1812
> - Routing attempts limit reached
>	This is the problem one, and it appears out of the blue. I've also now 
>discovered that it can happen for addresses which are not redirected.
>
>I'd appreciate any explanation of why the MTA would issue this particular 
>event.

Anyone had a few minutes to look into this for me?

Thanks,

grahame
3119.5IPMT ZUO101103 CFS.48825,Sev: 2ZUR01::ASHGGrahame Ash @RLEFri Feb 14 1997 08:130