I recently switched over to LightSpeed web server, thanks to help offered by Mike Edge. Everything's working fine, except that users complained about the 500 server error while making posts. Not everyone gets the error, so I tried analysing one of the posts that triggered the error. I found that if I removed the word 'select' from the post, I could post it without any issues. Apparently, the system thinks that 'select' is a dangerous keyword to be present in the post. I switched over to Apache web server and tried making the post without any changes - and the post was successful. It looks like Apache understood the content better than LightSpeed. I've several questions - 1. Should I completely disable mod_security? Is it safe? 2. How do I make sure that mod_security is in place and yet users don't get nasty errors while making posts? 3. What's the best way to deal with such situation? Every time I face such issue, my web hosts folks whitelist the rule and we get going. But that's not a long-term solution. So, the bottom line is - how do I ensure that my board works error free and accepts right content and rejects bad one?