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Home Blog / Personal Site problems due a (probable) bug in ISAPI_Rewrite 3 revision 0079
Site problems due a (probable) bug in ISAPI_Rewrite 3 revision 0079
Written by Division by Zero   
Thursday, 13 January 2011 20:47

Since last night I've had some problems with this site. Hopefully it didn't show, the main site kept working. The administrator part of the site couldn't be reached. Whenever a php file was requested in a subdirectory it caused a HTTP 404 error. Since I use Joomla 1.5 on an IIS 7 server it took a while before I figured out that the problem was with the .htaccess file.

IIS uses the ISAPI_Rewrite module to interpret the .htaccess file. This module was updated to revision 0079, which seems to have a bug. The original .htaccess file of Joomla contains this section:
########## 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

This should rewrite any requested url containing a php extension (among others). But if the file exists it shouldn't perform the rewrite action. This didn't work anymore. Changing the section to the following, solved the problem.
########## 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]
RewriteCond %{REQUEST_URI} !^/administrator/
RewriteCond %{REQUEST_URI} !^/plugins/
RewriteRule (.*) index.php
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
#
########## End - Joomla! core SEF Section

The added rules exclude the sub-directories from being rewritten. Of course any sub-directory containing php files must be added.

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