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customErrors Element (ASP.NET Settings Schema)

Provides information about custom error messages for an ASP.NET application. The customErrors element can be defined at any level in the application file hierarchy.

<configuration> Element
  system.web Element (ASP.NET Settings Schema)
    <customErrors>
<customErrors defaultRedirect="url"
              mode="On|Off|RemoteOnly">
     <error. . ./>
</customErrors>

The following sections describe attributes, child elements, and parent elements.

Attributes

Attribute

Description

defaultRedirect

Optional attribute.

Specifies the default URL to direct a browser to, if an error occurs. When this attribute is not specified, a generic error is displayed instead.

The URL can be absolute (for example, www.contoso.com/ErrorPage.htm) or relative. A relative URL, such as /ErrorPage.htm, is relative to the Web.config file that specified the URL for this attribute, not to the Web page in which the error occurred. A URL starting with a tilde (~), such as ~/ErrorPage.htm, indicates that the specified URL is relative to the root path of the application.

mode

Required attribute.

Specifies whether custom errors are enabled, disabled, or shown only to remote clients.

This attribute can be one of the following values.

ValueDescription
OnSpecifies that custom errors are enabled. If no defaultRedirect attribute is specified, users see a generic error. The custom errors are shown to the remote clients and to the local host.
OffSpecifies that custom errors are disabled. The detailed ASP.NET errors are shown to the remote clients and to the local host.
RemoteOnlySpecifies that custom errors are shown only to the remote clients, and that ASP.NET errors are shown to the local host. This is the default value.

The default is RemoteOnly.

redirectMode

Optional attribute.

Specifies values for how the URL of the original request is handled when a custom error page is displayed.

This attribute can be one of the following values.

ValueDescription
ResponseRedirectSpecifies that the URL to direct the browser to must be different from the original Web request URL.
ResponseRewriteSpecifies that the URL to direct the browser to must be the original Web request URL.

Child Elements

Element

Description

error

Optional element.

Specifies the custom error page for a given HTTP status code.

The error tag can appear multiple times. Each appearance defines one custom error condition.

Parent Elements

Element

Description

configuration

Specifies the root element in every configuration file that is used by the common language runtime and the .NET Framework applications.

system.web

Specifies the root element for the ASP.NET configuration settings in a configuration file and contains configuration elements that configure ASP.NET Web applications and control how the applications behave.

Default Configuration

The following default customErrors element is configured in the Machine.config file in the .NET Framework versions 1.0 and 1.1.

<customErrors mode="RemoteOnly" />

The following configuration example demonstrates how to specify the error handling pages to use for an ASP.NET application.

<configuration>
  <system.web>
    <customErrors defaultRedirect="GenericError.htm"
                  mode="RemoteOnly">
      <error statusCode="500"
             redirect="InternalError.htm"/>
    </customErrors>
  </system.web>
</configuration>

Configuration section handler

System.Web.Configuration.CustomErrorsSection

Configuration member

SystemWebSectionGroup.CustomErrors

System.Web.Configuration.CustomErrorsMode

Configurable locations

Machine.config

Root-level Web.config

Application-level Web.config

Virtual or physical directory–level Web.config

Requirements

Microsoft Internet Information Services (IIS) version 5.0, 5.1, or 6.0

The .NET Framework version 1.0, 1.1, or 2.0

Microsoft Visual Studio 2003 or Visual Studio 2005

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