si.
credo che il problema sia con virtuemart, poichè le pagine di articoli Joomla li rappresenta correttamente.
riporto di seguito le linee di codice del file .htaccess
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##
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# @version $Id: htaccess.txt 10492 2008-07-02 06:38:28Z ircmaxell $
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# @package Joomla
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# @copyright Copyright (C) 2005 - 2008 Open Source Matters. All rights reserved.
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# @license
http://www.gnu.org/copyleft/gpl.html GNU/GPL
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# Joomla! is Free Software
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##
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#####################################################
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# READ THIS COMPLETELY IF YOU CHOOSE TO USE THIS FILE
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#
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# The line just below this section: 'Options +FollowSymLinks' may cause problems
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# with some server configurations. It is required for use of mod_rewrite, but may already
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# be set by your server administrator in a way that dissallows changing it in
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# your .htaccess file. If using it causes your server to error out, comment it out (add # to
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# beginning of line), reload your site in your browser and test your sef url's. If they work,
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# it has been set by your server administrator and you do not need it set here.
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#
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#####################################################
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## Can be commented out if causes errors, see notes above.
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# Options +FollowSymLinks
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#
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# mod_rewrite in use
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RewriteEngine On
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########## Begin - Rewrite rules to block out some common exploits
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## If you experience problems on your site block out the operations listed below
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## This attempts to block the most common type of exploit `attempts` to Joomla!
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#
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# Block out any script trying to set a mosConfig value through the URL
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RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]
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# Block out any script trying to base64_encode crap to send via URL
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RewriteCond %{QUERY_STRING} base64_encode.*\(.*\) [OR]
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# Block out any script that includes a <script> tag in URL
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RewriteCond %{QUERY_STRING} (\<|%3C).*script.*(\>|%3E) [NC,OR]
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# Block out any script trying to set a PHP GLOBALS variable via URL
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RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\%[0-9A-Z]{0,2}) [OR]
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# Block out any script trying to modify a _REQUEST variable via URL
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RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\%[0-9A-Z]{0,2})
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# Send all blocked request to homepage with 403 Forbidden error!
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RewriteRule ^(.*)$ index.php [F,L]
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#
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########## End - Rewrite rules to block out some common exploits
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# Uncomment following line if your webserver's URL
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# is not directly related to physical file paths.
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# Update Your Joomla! Directory (just / for root)
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# RewriteBase /negozio/
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########## Begin - Joomla! core SEF Section
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#
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RewriteCond %{REQUEST_FILENAME} !-f
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RewriteCond %{REQUEST_FILENAME} !-d
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RewriteCond %{REQUEST_URI} !^/index.php
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RewriteCond %{REQUEST_URI} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ [NC]
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RewriteRule (.*) index.php
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RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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#
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########## End - Joomla! core SEF Section