Custom error mode off in web config

Three error modes in which an ASP.NET application can work:
1) Off Mode
2) On Mode
3) RemoteOnly Mode
The Error mode attribute determines whether or not an ASP.NET error message is displayed. By default, the mode value is set to "RemoteOnly".

Off Mode

When the error attribute is set to "Off", ASP.NET uses its default error page for both local and remote users in case of an error.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.web>
         <customErrors mode="Off" />
    </system.web>
</configuration>

On Mode

In case of "On" Mode, ASP.NET uses user-defined custom error page instead of its default error page for both local and remote users. If a custom error page is not specified, ASP.NET shows the error page describing how to enable remote viewing of errors.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.web>
         <customErrors defaultRedirect="error.htm" mode="On" />
    </system.web>
</configuration>
 
 the "defaultRedirect" attribute has been set to a user-defined page error.htm. 
this page can be html or aspx page.

RemoteOnly

ASP.NET error page is shown only to local users. Remote requests will first check the configuration settings for the custom error page or finally show an IIS error.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.web>
         <customErrors defaultRedirect="error.htm" mode="RemoteOnly" />
    </system.web>
</configuration>

Ex: error.htm

<HTML>
    <BODY>
        <b> sorry for the inconvenience, please wait sometime...<br> </b>
    </BODY>
</HTML>

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