Ive recently installed litespeed and enabled modsecurity. I'm currently testing with the delayed atomic rules which is free but I seem to get the error when using them:
mod_security: Access denied with code 406, [Rule: '' ''] [severity "WARNING"] [MatchedString ""]
All websites go down.
If I remove it then all works again. If I change from litespeed to apache and try it again with the rules all works fine.
Very strange. any ideas?