A user on my blog gets this message when he tries to post a comment:
An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.
Other people have been able to comment on other posts. I've emailed my host to see whether it can whitelist this particular commenter's IP address. I've also whitelisted his IP on Cloudflare, and disabled the BJLazyLoad plug-in, which apparently has some similar issues.
Is there anything else I should check?