Cloudflare, a leading content delivery network and cybersecurity provider, occasionally blocks user access to websites under its protection. This security measure is intended to shield sites from harmful activities such as SQL injections, cross-site scripting (XSS), and DDoS attacks. When users encounter a 'Your connection has been blocked' message on a site secured by Cloudflare, it usually means one of the following has occurred:

1. Malicious Activity: The user's action may have resembled an attack or contained specific malicious code.
2. Automated Systems: Certain automated scripts, crawlers, or bots might trigger security measures as they are deemed potential threats.
3. Security Filters: Some actions can activate predefined filters that interpret the input as suspicious.

If you find yourself blocked, there are several steps to take for resolution:

1. Contact Site Owner: Reach out to the website administrator via email or contact form, explaining what happened and providing the Cloudflare Ray ID mentioned in the block message.
2. Review Actions: Reflect on your recent activities on the site to determine if anything unusual occurred that might have triggered the security response.
3. Respect Security Measures: Acknowledge these measures as a standard practice for safeguarding online content against cyber threats.

Cloudflare's security features serve an essential role in maintaining the integrity and accessibility of websites on the internet, balancing between user experience and cybersecurity.