Google Webmaster Tools & XML Generators claim page to be unreachable
<p>I recently made some changes to my website and wanted to inspect everything using google webmaster tools &amp; update the sitemap using any site map generator i can find online.</p>

<p>However the sitemap generators <strong>fail to connect</strong> to my website and google claims the page to be <strong>unreachable</strong> i tried to remove my recently added .htaccess file but it didn't help</p>

<p>This is my .htaccess file which works fine for me. I can reach my page from all browsers with cleared cache etc ...</p>

<pre><code>RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^webdesign/(.*)$ /index.php?cl=$1
</code></pre>

<p>EDIT: Using Bing Webmaster Tools I receive:</p>

<pre><code>HTTP/1.1 500 Internal Server Error
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Connection: close
Date: Tue, 26 Jan 2016 07:16:56 GMT
Pragma: no-cache
Transfer-Encoding: chunked
Content-Type: text/html; charset=utf-8
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Server: Apache/2.2.31 (Unix)
Set-Cookie: sec_session_id=bq05b1i45qerls9crr9pv1cgm7; path=/; HttpOnly
Set-Cookie: lang=de; expires=Wed, 27-Jan-2016 07:16:56 GMT; Max-Age=86400
X-Powered-By: PHP/5.6.17
</code></pre>