The path for AuthUserFile is probably incorrect. Yours reads '/web/clients/', which means that the directory '/web/' should reside in the root directory of the server, which would be unlikely unless you're running a private server. Locate the actual path to your web files and you should be able to construct the correct path to your .htpasswd file, or simply make sure that the .htpasswd file resides in the same directory as the .htaccess file and remove the path information completely.
Rick Trethewey
Rainbo Design
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