If you look at the mod_security log, it should tell you what is being blocked. Perhaps you can paste the security alert here. Otherwise you'll need to do what I did, and that's searching through each mod_sec document in "modsecurity" and "modsecurity.d" and search for the text, kinda like when you do an edit in vB ya know? Find that text and depending upon the usage of it, you can alter the rule or remove it entirely if it's something like a blacklist. Nothing is perfect for all environments, but what I posted is for a WHM/cPanel environment. With DA I'm not sure how it compiles Apache, and what options you have and so forth. By process of elimination you can most of the time tweak the rule.