> ## Documentation Index
> Fetch the complete documentation index at: https://docs-dev-docs-event-stream-action-templates.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Describes the default Auth0 error page display information and parameters used for authorization error events.

# Default Auth0 Error Page

If your callback URL is valid, when an authorization error occurs, the <Tooltip tip="Authorization Server: Centralized server that contributes to defining the boundaries of a user’s access. For example, your authorization server can control the data, tasks, and features available to a user." cta="View Glossary" href="/docs/glossary?term=Authorization+Server">Authorization Server</Tooltip> returns the appropriate error and state parameters to your callback URL. In cases where your callback URL is invalid, your application will display the default generic Auth0 error page. Alternatively, you can customize the error pages. To learn more, read [Custom Error Pages](/docs/customize/login-pages/custom-error-pages).

To find the default page name for the generic error page, see [Use Version Control to Manage Your Universal Login Pages](/docs/customize/login-pages/classic-login/version-control).

## Display

The generic error page displays the following information if you have configured the associated fields in your [Tenant Settings](https://manage.auth0.com/#/tenant/).

| Field         | Description                                  |
| ------------- | -------------------------------------------- |
| Friendly Name | Name of your company                         |
| Logo URL      | URL of your company logo                     |
| Support Email | Email address of your company's support team |
| Support URL   | URL of your company's support page           |

## Parameters

The Authorization Server returns parameters appended to the URL as a query string.

| Parameter           | Description                                               |
| ------------------- | --------------------------------------------------------- |
| `client_id`         | Identifier of the Auth0 application.                      |
| `connection`        | Connection used at the time of error.                     |
| `lang`              | Language set for use at the time of error.                |
| `error`             | Error code of the error.                                  |
| `error_description` | Description of the error.                                 |
| `tracking`          | Identifier used by Auth0 to find errors in internal logs. |

Parameters presented vary depending on the error type and are specific to the request. For example, if the request did not contain a `client_id` and resulted in an error, no <Tooltip tip="Client ID: Identification value given to your registered resource from Auth0." cta="View Glossary" href="/docs/glossary?term=client+ID">client ID</Tooltip> will be returned by the error page.

## Learn more

* [Customize Error Pages](/docs/customize/login-pages/custom-error-pages)