I had the same issue with Red hat 5.
There are permissions to check on 2 files to get this corrected
# chmod 0600 /var/log/audit/audit.log
# chmod 0750 /usr/share/SnareDispatchHelper
Wah-Lah!
now you can open Snare web utility using
http://127.0.0.1:6161 (that's if you stayed with the defaulf config)
also if you check again and run
# /etc/init.d/auditd start
OK
instead of
[FAILED]
if this doesn't do the trick, check your
/var/log messages for answers
happy auditing