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Apache .htaccess Hot Link Blocking Code

Last Modified: 2013-12-08

I moved some domains from one registrar to another, and after the move, my .htaccess rewrite code is not working as it was before the registrar move.

The domains are being hosted on the same server before and after the registrar move.  Nothing has changed except the registrar move.  No files were moved or modified, etc.

The rewrite code prevents hot-linking to certain file types on the site ... here's the code:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?domain.com/.*$ [NC]
RewriteRule .*\.(gif|jpg|swf|dcr|txt|php|js|css)$ - [F]

Here's the problem:

When accessing the site using IE6 with URL: http://www.domain.com
the site is rendered without formatting -- i.e. the CSS is not loaded properly.

But when accessing the site using IE6 with URL: http://domain.com
the site is rendered correctly -- i.e. the CSS loads properly.

Strangely, FF3 renders the site correctly with both URL variants.

Removing the .htaccess hot-link blocking code, makes the IE6 problem go away.

I viewed the site with IE6 from different computers and different ISPs, just in case the problem was related to a single computer or ISP ... but the problem occurs in all tests.

To see if the problem was limited to just one domain, I tested all the transferred domains. The problem occurs on all transferred domains that contain the hot-link blocking code in .htaccess -- removing .htaccess makes the problem disappear.

Any ideas what may be causing this?

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