Error pages

Error pages appear when a user violates ETP policy. For example, when a user attempts to access content that is blocked by the Acceptable Use Policy (AUP) or attempts to access a blocked domain or IP address. An error page warns users that website access is prohibited and a violation occurred.

Note: The first time a policy is deployed with a Block action and an Error Page response, it may take up to 30 minutes for the error page to appear to the user.

You can change the appearance of the error pages. For a complete list of settings that you can modify, see Error page customization.

Error pages appear in the language that is associated with the end-user’s browser. These pages are translated by the browser.

Note: If you deployed ETP Client, a custom error page does not appear to end users who make requests from unidentified IP locations. Instead, the users see the Website Access Prohibited message without any customization.
These error pages are available in ETP:
  • Website Access Prohibited
  • Threat Website Warning
  • Acceptable User Policy Violation
  • Error Page Warning
  • User Authentication Error

Website Access Prohibited

This error page appears in these situations:
  • When a user from an Unidentified IPs location attempts to access a domain that may be a security risk. These users are typically remote users who access content from IP addresses that are not already configured as locations in ETP.
  • When ETP proxy is disabled and malicious HTTP or HTTPS traffic is directed to Enterprise Security Connector version 2.5.0.

Threat Website Warning

This message appears when a user attempts to access a domain that is a known or suspected threat. If the proxy is enabled, these error pages also appear for malicious HTTP or HTTPS traffic. The message is specific to the threat type. For example, any one of the following warnings may appear on this page:
  • Phishing Website Warning. Appears when a user attempts to access a domain that is known or suspected to perform phishing attacks.
  • Malware Website Warning. Appears when a user attempts to access a domain that is known to host malware.
  • C&C Website Warning. Appears when a user attempts to access a domain that is known to perform command and control communications.

Acceptable User Policy (AUP) or Application Visibility and Control (AVC) Violation

This message appears when a user violates the acceptable use policy (AUP) or application visibility and control (AVC) settings in a policy. The message indicates which AUP or AVC category was violated.

If a file is blocked as a result of a data loss prevention (DLP) configuration, this message appears:

Error Page Warning

An error message similar to this one appears when ETP or ETP Proxy cannot connect to the requested website. This may occur in any of these situations:
  • Connectivity issue to the origin website.
  • TLS certificate issue. This includes cases where ETP Proxy cannot validate an origin certificate. If an ETP administrator chooses to block origin certificates that cannot be verified, this error page appears to the user.
  • Unknown user or group attempting to access a website.
Depending on the situation, the error message may differ. For example, the following error message appears when there is an issue with the TLS certificate.

User Authentication Error

If authentication is enabled and configured in an acceptable use policy, this error message appears when a user enters invalid credentials to access a website.