Drupal 6.15 clean urls donot work for all

HI all, I had posted a query here. Drupal url alias and views and clear urls for taxonomy issues But i think i need to be more specific.

The issue is 开发者_高级运维that after upgrading drupal from version 5.1 to version 6.15 and enabling clean urls, most of the urls work however some URLS such as admin login/logout and taxonomy related pages do not work.

I have search on drupal and google. Most of the issues reported are of clean urls completely not working. However i have clean urls but that works partially..

Any suggestion on this highly appreciated. And sorry for ambiguous posts.

edit: If i try a url http://www.example.com/node/add/story then i get a access denied page. But if i try http://www.example.com?q=node/add/story i am taken to a correct page. Also if i need to logout, http://www.example.com/logout takes me to access denied page but if i try http://www.example.com?q=logout i am successfully logged out.

UPDATE The issue is still not solve. I am still not sure, what could be the problem.

Is "Clean URLs" set to "Enabled" in admin/settings/clean-urls?

turn off directory browsing in your .htaccess file by writing:

Options +Indexes

instead of

Options -Indexes

http://drupal.org/node/134440