[Snort-devel] Possible Snort Bug

Dan Garbar dgarbar at ...3397...
Tue Apr 16 14:50:25 EDT 2013

Hi all,


I'm a novice, but have found a solution and want to share it with everyone.


If someone has any idea how this may have happened, I would gladly like to
hear it.



I'm using Snort Ver. pkg v. 2.5.5 Built from source


I was getting the following error:


snort[41480]: FATAL ERROR:
/usr/local/etc/snort/snort_7455_em2/preproc_rules/decoder.rules(1) Unknown
ClassType: protocol-command-decode


After working with Joel Esler (Senior Research Engineer, VRT / OpenSource
Community Manager at Sourcefire) who has asked the right questions, I was
able to determine that the following files were empty:





So Snort was unable to decode a rule and thus gave me the above error.


To fix this I copied the contents from 

/usr/local/etc/snort/classification.config to



Started Snort and it worked!


Please note, I have not been modifying any files before this. This is my
first time in that area. So this empty file business must be either update
related or something else - This I'd like to know.


Thanks all.



IT Administrator - Dano















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