Make a direcory to put the old files in old-files allready exists so I 
used keep
# mkdir /etc/snort/rules-update/keep
Change to that dir
# cd /etc/snort/rules-update/keep
Get the old rules
# wget http://www.montgomeryco.com/bfiles/snort-rules/rules.tar.gz
Explode them
# tar -xzvf rules.tar.gz
Delete the rules that are in use.
# rm -f /etc/snort/*.rules
Copy the rules
# cp *.rules /etc/snort
Restart snort
# /etc/rc.d/init.d/snortd restart

Check to see that you don't have the errors
# tail /var/log/messages
Should see Somthing like this.


Jul 13 12:40:17 high snort-mysql:  All
Jul 13 12:40:17 high snort-mysql:
Jul 13 12:40:17 high snort-mysql: Portscan2 config:
Jul 13 12:40:17 high snort-mysql:     log: /var/log/snort/scan.log
Jul 13 12:40:17 high snort-mysql:     scanners_max: 3200
Jul 13 12:40:17 high snort-mysql:     targets_max: 5000
Jul 13 12:40:17 high snort-mysql:     target_limit: 5
Jul 13 12:40:17 high snort-mysql:     port_limit: 20
Jul 13 12:40:17 high snort-mysql:     timeout: 60
Jul 13 12:40:18 high snort-mysql: Snort initialization completed 
successfully, Snort running

If this fixed it remove the call to update whereever it is. Mine was once 
a week. Otherwise it will update and ruin the rules again.
 
#  rm /etc/cron.weekly/update-snort.cron