Cloudflare is a popular web security service that protects websites from various cyber threats such as DDoS attacks, spam bots, and other malicious activities. Occasionally, it may block certain actions or visitors to prevent potential security breaches on its protected sites.

Why Have I Been Blocked? When you encounter a 'This website is using a security service to protect itself from online attacks' message, it typically means that your action or request has been flagged as suspicious by Cloudflare. This can happen due to several reasons including submitting specific content or commands that are identified as potential threats.

Actions Triggering Blocking:

• Submitting certain keywords or phrases deemed harmful or threatening by the website’s owner.
• Executing SQL commands from form inputs, which could lead to database injection attacks.
• Sending malformed data that may cause a server error or security vulnerability.

Resolving the Issue:

1. Contact Site Owner: The most direct way to resolve this is by contacting the website owner. You can usually find a 'Contact Us' page on the site's menu or footer. Provide the owner with details of what happened, including the specific actions you took leading up to being blocked and the Cloudflare Ray ID found at the bottom of the error message.
2. Review Submission: If your action inadvertently triggered the security measure (e.g., using a specific keyword in a comment), consider reviewing and adjusting your content before resubmitting or contacting the site owner.
3. Check for Updates: Ensure your browser, plugins, or any software you use to interact with websites are up-to-date. This helps avoid compatibility issues that might lead to triggering security measures unintentionally.

Cloudflare’s blocking mechanism is designed to protect sites from potential threats, but it can occasionally result in legitimate users being blocked. Proper communication and understanding are key to resolving such issues quickly.