new users redirected to index.php - 403 error - Joomla! Forum - community, help and support

after users register directed site index. http://www.site.com/index.php shows error, how can fixed:

code: select all

403 - not authorised view resource.

you may not able visit page because of:

   1. out-of-date bookmark/favourite
   2. search engine has out-of-date listing site
   3. mistyped address
   4. have no access page
   5. requested resource not found.
   6. error has occurred while processing request.

please try 1 of following pages:

    * home page

if difficulties persist, please contact system administrator of site.

you not authorised view resource.

my site htaccess file:

code: select all

rewriteengine on

##
# @version $id: htaccess.txt 10492 2008-07-02 06:38:28z ircmaxell $
# @package joomla
# @copyright copyright (c) 2005 - 2008 open source matters. rights reserved.
# @license http://www.gnu.org/copyleft/gpl.html gnu/gpl
# joomla! free software
##


#####################################################
#  read if choose use file
#
# line below section: 'options +followsymlinks' may cause problems
# server configurations.  required use of mod_rewrite, may already
# set server administrator in way dissallows changing in
# .htaccess file.  if using causes server error out, comment out (add # to
# beginning of line), reload site in browser , test sef url's.  if work,
# has been set server administrator , not need set here.
#
#####################################################

##  can commented out if causes errors, see notes above.
options +followsymlinks

#
#  mod_rewrite in use

rewriteengine on

########## begin - rewrite rules block out common exploits
## if experience problems on site block out operations listed below
## attempts block common type of exploit `attempts` joomla!
#
# block out script trying set mosconfig value through url
rewritecond %{query_string} mosconfig_[a-za-z_]{1,21}(=|\%3d) [or]
# block out script trying base64_encode crap send via url
rewritecond %{query_string} base64_encode.*\(.*\) [or]
# block out script includes <script> tag in url
rewritecond %{query_string} (\<|%3c).*script.*(\>|%3e) [nc,or]
# block out script trying set php globals variable via url
rewritecond %{query_string} globals(=|\[|\%[0-9a-z]{0,2}) [or]
# block out script trying modify _request variable via url
rewritecond %{query_string} _request(=|\[|\%[0-9a-z]{0,2})
# send blocked request homepage 403 forbidden error!
rewriterule ^(.*)$ index.php [f,l]
#
########## end - rewrite rules block out common exploits

#  uncomment following line if webserver's url
#  not directly related physical file paths.
#  update joomla! directory (just / root)

# rewritebase /


########## begin - joomla! core sef section
#
rewritecond %{request_filename} !-f
rewritecond %{request_filename} !-d
rewritecond %{request_uri} !^/index.php
rewritecond %{request_uri} (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$  [nc]
rewriterule (.*) index.php
rewriterule .* - [e=http_authorization:%{http:authorization},l]
#
########## end - joomla! core sef section

# start .htaccess file - change /your-photoplog_dir/ photoplog directory
rewriteengine on
rewritebase /
rewriterule /gallery/file_([0-9]+)\.jpg$ /gallery/file.php?n=$1 [l]
# end .htaccess file




ok,
not quite security post,
whats bit @ end of htaccess for?
what happens when remove that?
use forum post tool
what folder joomla located in?