I am using this wonderful plugin, it's all perfect. I only have a question. When a link has expired, or is inactive, or just the user has removed my site's link, does LinX remove automatically his link, or does it only notify me?

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This error 403 access forbidden, means that a request for a “bare” directory path has been made, no default directory index page is present and the site manager does not want a file listing displayed in its place.
If you have problems accessing a particular file or directory, ensure that the Web server has permission to read those files. Usually, the Web server will operate under a special user account, so make sure that user has read permission.

In this case, either create an index for that directory or change the settings to permit directory listings. For Apache, use the Options +Indexes directive in the .htaccess file for the directory.