To help fit your site’s needs, the Sucuri firewall offers you many security options. All of them can be found under Security in the Sucuri firewall settings page.
Here is what they mean:
Admin panel restricted to only Whitelisted IP addresses
Most popular content management systems have an administrative panel. Example: /wp-admin on WordPress or /administrator on Joomla. If you set it to On, only whitelisted IP addresses will be able to access those directories. If you have a membership site and you allow anyone to create an account and login there, do not enable this option.
Additional Security Headers added to your site.
This option will add some recommended security headers to your site in order to protect you against some forms of XSS and clickjacking attacks. If you allow other sites to 'iframe' your content, do not enable this option. The following headers will be added: X-XSS-Protection, X-Frame-Options, X-Content-Type-Options
XMLRPC, Comments and Trackbacks blocked.
If your site does not allow comments (or trackbacks/pingbacks), or if you use an external commenting system (like Disqus or Facebook comments), you can block any comment attempt, since it is likely to be spam.
Stop unfiltered HTML from being sent to your site.
This option prevents users from inserting or sending unfiltered HTML content to your site. It will block things like iframes and script calls from being used. If you have a forum or membership site and you allow your users to send messages and post open content, do not enable this option. Note that whitelisted IP addresses are not affected by this setting.
Stop upload of PHP or executable content.
This option will prevent anyone from uploading PHP, Perl or executable content to your site. We recommend enabling this option unless you do allow users to do uploads. Note that whitelisted IP addresses are still allowed to do uploads.
Advanced Evasion Detection.
This option will enable our advanced evasion detection signatures. We recommend keeping it on, but if your site supports URL's on non-ascii characters like (Japenese, Hindi, Russian, etc.) you may need to disable it.
Enable Emergency DDOS protection.
Advanced Intrusion Detection System.
This option enables our advanced IDS (Intrusion Detection System) rules that run in the backend and try to block repeated attackers. We recommend keeping this option enabled, unless recommended by our support team.
Block proxies and the top three attack countries (China, Russia and Turkey).
Enabling this option will prevent anyone from China, Russia or Turkey from interacting with your site. They are still able to view all content, but not register an account, submit comments or attempt to login (basically lock to read-only mode). The same restriction applies to users using anonymous proxy services to hide their IP addresses.
Aggressive bot filter
This setting will block invalid user agents that do not match real browsers like empty user agents, user agents that start with PHP/, and improper user agents from common browsers.