AH01630: client denied by server configuration:

I have suddenly started to receive the error message.


An error occurred while executing this script!

If you are a Contao user, contact the administrator of your website.
Open file system/logs/error.log and search for a corresponding entry.
Open file system/config/localconfig.php and add the following line:

$GLOBALS['TL_CONFIG']['displayErrors'] = true;

Read the Contao FAQs or visit the Contao support page.

I looked at the system/log/error.log file and there were multiple lines of like below.

[2020-01-03 15:58:05] [authz_core:error] [client <IP address>:0] AH01630: client denied by server configuration: /mnt/website/standard/e/i/<my domain name>/web/........html

I am using Contao version 3.5.6 but sadly my the company that is hosting my site have not provided me with the Apache version but my .htaccess file looks like this:

##
# Contao Open Source CMS
#
# Copyright (c) 2005-2015 Leo Feyer
#
# @license LGPL-3.0+
##

##
# Prevent access to the Contao template files
##
<FilesMatch "\.(tpl|html5|xhtml)$">
<IfModule !mod_authz_core.c>
Order deny,allow
Deny from all
</IfModule>
<IfModule mod_authz_core.c>
Require all denied
</IfModule>
</FilesMatch>

##
# Allow access from all domains for webfonts
# @see https://github.com/h5bp/html5-boilerplate
##
<IfModule mod_headers.c>
<FilesMatch "\.(ttf|ttc|otf|eot|woff2?|font\.css)$">
Header set Access-Control-Allow-Origin "*"
</FilesMatch>
</IfModule>

##
# Disable ETags
# @see http://developer.yahoo.com/performance/rules.html#etags
##
FileETag None
<IfModule mod_headers.c>
Header unset ETag
</IfModule>

##
# Set the proper MIME types
# @see https://github.com/h5bp/html5-boilerplate
##
<IfModule mod_mime.c>
AddType application/javascript js jsonp
AddType application/json json
AddType audio/ogg oga ogg
AddType audio/mp4 m4a f4a f4b
AddType video/ogg ogv
AddType video/mp4 mp4 m4v f4v f4p
AddType video/webm webm
AddType video/x-flv flv
AddType image/svg+xml svg svgz
AddEncoding gzip svgz
AddType application/vnd.ms-fontobject eot
AddType application/x-font-ttf ttf ttc
AddType font/opentype otf
AddType application/x-font-woff woff woff2
AddType image/x-icon ico
AddType image/webp webp
AddType text/cache-manifest appcache manifest
AddType text/x-component htc
AddType application/xml rss atom xml rdf
AddType application/x-web-app-manifest+json webapp
AddType text/x-vcard vcf
AddType application/x-shockwave-flash swf
</IfModule>

##
# Gzip compression
# @see https://github.com/h5bp/html5-boilerplate
##
<IfModule mod_deflate.c>
<IfModule mod_filter.c>
AddOutputFilterByType DEFLATE text/html text/plain text/css application/json
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE text/xml application/xml text/x-component
AddOutputFilterByType DEFLATE application/xhtml+xml application/rss+xml application/atom+xml
AddOutputFilterByType DEFLATE image/x-icon image/svg+xml application/vnd.ms-fontobject application/x-font-ttf font/opentype
</IfModule>
</IfModule>

##
# Expires headers (for better cache control)
# @see https://github.com/h5bp/html5-boilerplate
##
<IfModule mod_expires.c>
ExpiresActive on

##
# Productional website
##
ExpiresByType text/cache-manifest "access plus 0 seconds"
ExpiresByType text/html "access plus 0 seconds"
ExpiresByType text/xml "access plus 0 seconds"
ExpiresByType application/xml "access plus 0 seconds"
ExpiresByType application/json "access plus 0 seconds"
ExpiresByType application/rss+xml "access plus 1 hour"
ExpiresByType application/atom+xml "access plus 1 hour"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType image/x-icon "access plus 1 month"
ExpiresByType video/ogg "access plus 1 month"
ExpiresByType audio/ogg "access plus 1 month"
ExpiresByType video/mp4 "access plus 1 month"
ExpiresByType video/webm "access plus 1 month"
ExpiresByType text/x-component "access plus 1 month"
ExpiresByType application/x-font-ttf "access plus 1 month"
ExpiresByType font/opentype "access plus 1 month"
ExpiresByType application/x-font-woff "access plus 1 month"
ExpiresByType image/svg+xml "access plus 1 month"
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
ExpiresByType text/css "access plus 1 year"
ExpiresByType application/javascript "access plus 1 year"

##
# Disable caching during development
# @see https://github.com/contao/core/issues/4364
##
#ExpiresByType text/cache-manifest "access"
#ExpiresByType text/html "access"
#ExpiresByType text/xml "access"
#ExpiresByType application/xml "access"
#ExpiresByType application/json "access"
#ExpiresByType application/rss+xml "access"
#ExpiresByType application/atom+xml "access"
#ExpiresByType image/gif "access"
#ExpiresByType image/png "access"
#ExpiresByType image/jpeg "access"
#ExpiresByType image/x-icon "access"
#ExpiresByType video/ogg "access"
#ExpiresByType audio/ogg "access"
#ExpiresByType video/mp4 "access"
#ExpiresByType video/webm "access"
#ExpiresByType text/x-component "access"
#ExpiresByType application/x-font-ttf "access"
#ExpiresByType font/opentype "access"
#ExpiresByType application/x-font-woff "access"
#ExpiresByType image/svg+xml "access"
#ExpiresByType application/vnd.ms-fontobject "access"
#ExpiresByType text/css "access"
#ExpiresByType application/javascript "access"

</IfModule>

##
# Header adjustments
##
<IfModule mod_headers.c>

##
# Disable caching during development
# @see https://github.com/contao/core/issues/4364
##
#Header unset Cache-Control
#Header append Cache-Control must-revalidate

##
# Do not cache the cron.txt file
# @see https://github.com/contao/core/issues/5105
##
<FilesMatch "cron\.txt$">
Header set Cache-Control "no-cache, no-store, must-revalidate, max-age=0, proxy-revalidate, no-transform"
</FilesMatch>

##
# Add a Vary Accept-Encoding header for the compressed resources. If you
# modify the file types above, make sure to change them here accordingly.
# @see http://developer.yahoo.com/performance/rules.html#gzip
#
# Note: If you are using a case-sensitive file system like HFS+ or ext4, you
# have to change the <FilesMatch> directive as follows:
#
# <FilesMatch "\.(?i:js|css|xml|gz|svgz)$">
#
# For more information see: https://github.com/contao/core/issues/4364
##
<FilesMatch "\.(js|css|xml|gz|svgz)$">
Header append Vary Accept-Encoding
</FilesMatch>

</IfModule>

##
# Disable MultiViews if you are having issues with requests returning the wrong
# page. Requires AllowOverride Options=All,MultiViews to be set here.
# @see https://github.com/contao/core/issues/3521
##
#Options -MultiViews

##
# URL rewriting
##
<IfModule mod_rewrite.c>
RewriteEngine On

##
# Change the RewriteBase if your Contao installation is in a subdirectoy and
# the rewrite rules are not working properly. Usage examples:
#
# RewriteBase /contao-3.0.0
# RewriteBase /path/to/contao
#
# Depending on your server, you might have to remove the line entirely.
##
RewriteBase /

##
# Uncomment the following lines to add "www." to the domain:
#
RewriteCond %{HTTP_HOST} ^MYDOMAIN/NAME$ [NC]
RewriteRule (.*) http://www.MYDOMAIN.NAME/$1 [R=301,L]
#
# Uncomment the following lines to remove "www." from the domain:
#
# RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC]
# RewriteRule (.*) http://example.com/$1 [R=301,L]
#
# Make sure to replace "example.com" with your domain name.
##

##
# If you cannot use mod_deflate, uncomment the following lines to load a
# compressed .gz version of the aggregated Contao JavaScript and CSS files.
##
#AddEncoding gzip .gz
#<FilesMatch "\.js\.gz$">
# AddType "application/javascript" .gz
#</FilesMatch>
#<FilesMatch "\.css\.gz$">
# AddType "text/css" .gz
#</FilesMatch>
#RewriteCond %{HTTP:Accept-encoding} gzip
#RewriteCond %{REQUEST_FILENAME} \.(js|css)$
#RewriteCond %{REQUEST_FILENAME}.gz -f
#RewriteRule ^(.*)$ $1.gz [QSA,L]

##
# By default, Contao adds ".html" to the generated URLs to simulate static
# HTML documents. If you change the URL suffix in the back end settings, make
# sure to change it here accordingly!
#
# RewriteRule .*\.html$ index.php [L] # URL suffix .html
# RewriteRule .*\.txt$ index.php [L] # URL suffix .txt
# RewriteRule .*\.json$ index.php [L] # URL suffix .json
#
# If you do not want to use an URL suffix at all, you have to add a third
# line to prevent URLs that point to folders from being rewritten (see #4031).
#
# RewriteCond %{REQUEST_FILENAME} !-d
# RewriteRule .* index.php [L]
#
# If you are using mod_cache, it is recommended to use the RewriteRule below,
# which adds the query string to the internal URL:
#
# RewriteRule (.*\.html)$ index.php/$1 [L]
#
# Note that not all environments support mod_rewrite and mod_cache.
##
RewriteCond %{REQUEST_FILENAME} !\.(htm|php|js|css|map|htc|png|gif|jpe?g|ico|xml|c sv|txt|swf|flv|mp4|webm|ogv|mp3|ogg|oga|eot|otf|tt[cf]|woff2?|svgz?|pdf|gz)$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule .*\.html$ index.php [L]

##
# The following rules are required if you want to pass the language as first
# URL parameter (added in Contao 2.11). The first rule rewrites the empty URL
# to the front end controller, the second one adds a missing trailing slash.
##
RewriteRule ^[a-z]{2}(\-[A-Z]{2})?/$ index.php [L]
RewriteRule ^([a-z]{2}(\-[A-Z]{2})?)$ $1/ [R=301,L]

# http -> https Rewrite
RewriteEngine On
# http -> https
RewriteCond %{HTTPS} !on [NC]
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# non-www -> www
RewriteCond %{HTTP_HOST} !^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
##

</IfModule>



My first thought was that the Apache server had been upgraded but I have had no notification of this from my web hosting provider so I am not sure that it is a problem with the <my domain name>/web/.htaccess file.

Please also tell us the Contao version!

Furthermore, check (e.g. in the PHP Info) the Apache version and post your .htaccess file.