Re: [Quickfix-users] Debugging help needed - checksums are off

[Oren M. <or...@qu...>]

My guess is that they are using the BeginString field as part of the  
checksum calculation.  They are not supposed to do this because only  
fields appearing after the length fuels and before the checksum field  
itself should be included in the checksum calculation.  You can verify  
this by doing a checksum on just the begin stein itself ( add up the  
charachter values +1 for the son, mid by 256).  If you get 20, that's  
probably your culprit.

At this point they can either fix the problem, which is best, or you  
can use the configuration setting in quickfix to ignore checksum  
validation.

On May 16, 2008, at 5:18 PM, "Jonathan Allen" <ja...@fi...>  
wrote:

> QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
> I am having a problem with checksums being off. As you can see from  
> my log snippet, they seem to be consistently off by +20.
>
>
>
> My partner company is not using QuickFix, though I don’t know what t 
> hey are using. Recently they added a couple of stipulations, but tha 
> t is just a repeating group whose fields we already know.
>
>
>
> 1. What can cause this besides them sending me the wrong checksum?
>
> 2. Is there a way to calculate the checksums by hand?
>
> 3. Is there a history of different FIX engines calculating the  
> checksum differently?
>
>
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=34, Recieved  
> CheckSum=54
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=201, Recieved  
> CheckSum=221
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=35, Recieved  
> CheckSum=55
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=169, Recieved  
> CheckSum=189
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=47, Recieved  
> CheckSum=67
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=204, Recieved  
> CheckSum=224
>
> 20080516-22:07:34 : Invalid message: Expected CheckSum=151, Recieved  
> CheckSum=171
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=148, Recieved  
> CheckSum=168
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=212, Recieved  
> CheckSum=232
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=216, Recieved  
> CheckSum=236
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=238, Recieved  
> CheckSum=2
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=28, Recieved  
> CheckSum=48
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=226, Recieved  
> CheckSum=246
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=72, Recieved  
> CheckSum=92
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=205, Recieved  
> CheckSum=225
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=84, Recieved  
> CheckSum=104
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=200, Recieved  
> CheckSum=220
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=59, Recieved  
> CheckSum=79
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=183, Recieved  
> CheckSum=203
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=245, Recieved  
> CheckSum=9
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=67, Recieved  
> CheckSum=87
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=45, Recieved  
> CheckSum=65
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=196, Recieved  
> CheckSum=216
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=218, Recieved  
> CheckSum=238
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=18, Recieved  
> CheckSum=38
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=237, Recieved  
> CheckSum=1
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=123, Recieved  
> CheckSum=143
>
> 20080516-22:07:35 : Invalid message: Expected CheckSum=93, Recieved  
> CheckSum=113
>
>
>
> Jonathan Allen
>
> Software Developer
>
> Fixed Income Securities, Inc.
>
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>
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>
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>
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