How to Redirect any subdomain request to main domain in asp.net

Question

I\'m trying to redirect all subdomain requests for domain.com to www.domain.com and user must access all part of website only by enter to main domain and click on links , for ex

Answer 1

Using the URL Rewriting module could be the way to go. Try using configuration similar to the following:

<system.webServer>
    <rewrite>
        <rules>
            <clear />
            <rule name="Redirect to WWW" enabled="true" stopProcessing="true">
                <match url=".*" />
                <conditions logicalGrouping="MatchAll">
                    <add input="{HTTP_HOST}" pattern=".*" />
                </conditions>
                <action type="Redirect" url="http://www.domain.com/{R:0}" />
            </rule>
        </rules>
    </rewrite>
</system.webServer>

This will redirect without showing an error page. If you want to show an error page then you'll need to redirect to a page that takes the return URL and does a client-side redirect to the right place.

As @inspile says you're going to have trouble doing it for sub-pages of the site. You may be able to do it using the referer to make sure it's from a link on the main site. Again the URL Rewrite module is the way to go here.

Cheers

Answer 2

For the subdomains, you can either redirect them using your web hosting's Control Panel, or if you have the subdomains setup on a server that you can remote into, use the URL Rewrite module in IIS Manager to redirect all requests for the subdomain to your www subdomain. Using URL Rewrite, you don't have to show an error page, the redirect will happen automatically.

You're not going to be able to restrict users from accessing pages using links only.