Cisco Umbrella Block Page __full__ Jun 2026

Another limitation is that the block page only triggers on explicit HTTP/HTTPS requests. Applications that use non-web protocols or hardcoded IP addresses may not render an HTML block page, leaving users confused about why a service is failing.

At its core, the block page is the user-facing manifestation of a security decision. When a user attempts to navigate to a domain or URL that violates an organization's policy—whether due to malware, phishing, command-and-control (C2) callbacks, or simply a prohibited category like social media or adult content—Cisco Umbrella intercepts the request. Instead of resolving the DNS query to the intended IP address, Umbrella returns an IP address that points to its own block page server. The user’s browser then displays a page stating that access has been blocked. cisco umbrella block page