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Config system.web customErrors

Use the customErrors attribute to configure how errors must be presented

An example of this <system.web> section is:

<customErrors mode="On|Off|RemoteOnly" defaultRedirect="somepage.aspx">
  <error statusCode="400" redirect="error400.aspx" />

mode specifies if this setting is enabled for every request (On), enabled for remote requests only (RemoteOnly) or disabled.

The default is RemoteOnly

defaultRedirect is the redirection sent when no explicit <error> exists for a given error status code.