Well, your htaccess code is fully customized by multiple plugins. One of them is Better WP security that we have no problem with it but you should disable common features like hiding wp-login and wp-admin (See FAQ for more).
After disabling common features try removing this part of the code (That was repeated):
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
If it didn’t help please install WP htaccess editor plugin and provide login details for more tests.
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This reply was modified 11 years, 2 months ago by Hassan.