The file browser is disabled for security reasons

Hello folks,
I'm having difficulties with CKFinder module installed on my Drupal 6.2 site.
After proper installation I tried to upload an image but this was the result:
"The file browser is disabled for security reasons. Please contact your system administrator and check the CKFinder configuration file."
I have chcecked my conf.php several times with all manuals, All folders has 0777 permisions..
I'm really struggling this time...
Can you suggest me any solutions? Thanks in advance..