Fatal error: Class 'Akeeba\Engine\Platform' not found in /home/xxxxx/public_html/plugins/quickicon/akeebabackup/akeebabackup.php on line 198
I haven't been able to find an update on a solution to the problem. The frontend works fine after the creation of the .httaccess file but the backend goes to a white screen with the above error message. So I renamed the created .httaccess file to restore the backend access.
The created .httaccess looks like this (I replaced the domain name to hide it):
### ===========================================================================
### Security Enhanced & Highly Optimized .htaccess File for Joomla!
### automatically generated by Admin Tools 3.6.5 on 2015-12-02 21:37:58 GMT
### Auto-detected Apache version: 2.5 (best guess)
### ===========================================================================
###
### The contents of this file are based on the same author's work "Master
### .htaccess", published on http://snipt.net/nikosdion/the-master-htaccess
###
### Admin Tools is Free Software, distributed under the terms of the GNU
### General Public License version 3 or, at your option, any later version
### published by the Free Software Foundation.
###
### !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! IMPORTANT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
### !! !!
### !! If you get an Internal Server Error 500 or a blank page when trying !!
### !! to access your site, remove this file and try tweaking its settings !!
### !! in the back-end of the Admin Tools component. !!
### !! !!
### !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
###
##### RewriteEngine enabled - BEGIN
RewriteEngine On
##### RewriteEngine enabled - END
##### RewriteBase set - BEGIN
RewriteBase /
##### RewriteBase set - END
##### File execution order -- BEGIN
DirectoryIndex index.php index.html
##### File execution order -- END
##### No directory listings -- BEGIN
IndexIgnore *
Options -Indexes
##### No directory listings -- END
##### Redirect index.php to / -- BEGIN
RewriteCond %{THE_REQUEST} !^POST
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.php\ HTTP/
RewriteCond %{SERVER_PORT}>s ^(443>(s)|[0-9]+>s)$
RewriteRule ^index\.php$ http%2://xxxxxx.com/ [R=301,L]
##### Redirect index.php to / -- END
##### Rewrite rules to block out some common exploits -- BEGIN
RewriteCond %{QUERY_STRING} proc/self/environ [OR]
RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]
RewriteCond %{QUERY_STRING} base64_(en|de)code\(.*\) [OR]
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} GLOBALS(=|\[|\[0-9A-Z]{0,2}) [OR]
RewriteCond %{QUERY_STRING} _REQUEST(=|\[|\[0-9A-Z]{0,2})
RewriteRule .* index.php [F]
##### Rewrite rules to block out some common exploits -- END
##### File injection protection -- BEGIN
RewriteCond %{REQUEST_METHOD} GET
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=http:// [OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=(\.\.//?)+ [OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=/([a-z0-9_.]//?)+ [NC]
RewriteRule .* - [F]
##### File injection protection -- END
##### Advanced server protection rules exceptions -- BEGIN
RewriteRule ^administrator\/components\/com_akeeba\/restore\.php$ - [L]
RewriteRule ^administrator\/components\/com_admintools\/restore\.php$ - [L]
RewriteRule ^administrator\/components\/com_joomlaupdate\/restore\.php$ - [L]
RewriteRule ^plugins\/quickicon\/akeebabackup\/akeebabackup\.php$ - [L]
RewriteRule ^templates\/your_template_name_here/ - [L]
##### Advanced server protection rules exceptions -- END
##### Advanced server protection -- BEGIN
RewriteCond %{QUERY_STRING} \=PHP[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12} [NC]
RewriteRule .* - [F]
## Back-end protection
RewriteRule ^administrator/?$ - [L]
RewriteRule ^administrator/index\.(php|html?)$ - [L]
RewriteRule ^administrator/index[23]\.php$ - [L]
RewriteRule ^administrator/(components|modules|templates|images|plugins)/.*\.(jpe|jpg|jpeg|jp2|jpe2|png|gif|bmp|css|js|swf|html|mpg|mp3|mpeg|mp4|avi|wav|ogg|ogv|xls|xlsx|doc|docx|ppt|pptx|zip|rar|pdf|xps|txt|7z|svg|odt|ods|odp|flv|mov|htm|ttf|woff|woff2|eot|JPG|JPEG|PNG|GIF|CSS|JS|TTF|WOFF|WOFF2|EOT)$ - [L]
RewriteRule ^administrator/ - [F]
## Allow limited access for certain Joomla! system directories with client-accessible content
RewriteRule ^(components|modules|templates|images|plugins|media|libraries|media/jui/fonts)/.*\.(jpe|jpg|jpeg|jp2|jpe2|png|gif|bmp|css|js|swf|html|mpg|mp3|mpeg|mp4|avi|wav|ogg|ogv|xls|xlsx|doc|docx|ppt|pptx|zip|rar|pdf|xps|txt|7z|svg|odt|ods|odp|flv|mov|ico|htm|ttf|woff|woff2|eot|JPG|JPEG|PNG|GIF|CSS|JS|TTF|WOFF|WOFF2|EOT)$ - [L]
RewriteRule ^(components|modules|templates|images|plugins|media|libraries|media/jui/fonts)/ - [F]
## Disallow front-end access for certain Joomla! system directories (unless access to their files is allowed above)
RewriteRule ^includes/js/ - [L]
RewriteRule ^(cache|includes|language|logs|log|tmp)/ - [F]
RewriteRule ^(configuration\.php|CONTRIBUTING\.md|htaccess\.txt|joomla\.xml|LICENSE\.txt|phpunit\.xml|README\.txt|web\.config\.txt) - [F]
## Disallow access to rogue PHP files throughout the site, unless they are explicitly allowed
RewriteCond %{REQUEST_FILENAME} (\.php)$
RewriteCond %{REQUEST_FILENAME} !(/index[23]?\.php)$
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule (.*\.php)$ - [F]
## Disallow access to htaccess.txt, php.ini and configuration.php-dist
RewriteRule ^(htaccess\.txt|configuration\.php-dist|php\.ini)$ - [F]
## Protect against clickjacking
<IfModule mod_headers.c>
Header always append X-Frame-Options SAMEORIGIN
# The `X-Frame-Options` response header should be send only for
# HTML documents and not for the other resources.
<FilesMatch "\.(appcache|atom|bbaw|bmp|crx|css|cur|eot|f4[abpv]|flv|geojson|gif|htc|ico|jpe?g|js|json(ld)?|m4[av]|manifest|map|mp4|oex|og[agv]|opus|otf|pdf|png|rdf|rss|safariextz|svgz?|swf|topojson|tt[cf]|txt|vcard|vcf|vtt|webapp|web[mp]|woff2?|xloc|xml|xpi)$">
Header unset X-Frame-Options
</FilesMatch>
</IfModule>
## Reduce MIME type security risks
<IfModule mod_headers.c>
Header set X-Content-Type-Options "nosniff"
</IfModule>
## Reflected XSS prevention
<IfModule mod_headers.c>
Header set X-XSS-Protection "1; mode=block"
</IfModule>
# mod_headers cannot match based on the content-type, however,
# the X-XSS-Protection response header should be send only for
# HTML documents and not for the other resources.
<IfModule mod_headers.c>
<FilesMatch "\.(appcache|atom|bbaw|bmp|crx|css|cur|eot|f4[abpv]|flv|geojson|gif|htc|ico|jpe?g|js|json(ld)?|m4[av]|manifest|map|mp4|oex|og[agv]|opus|otf|pdf|png|rdf|rss|safariextz|svgz?|swf|topojson|tt[cf]|txt|vcard|vcf|vtt|webapp|web[mp]|webmanifest|woff2?|xloc|xml|xpi)$">
Header unset X-XSS-Protection
</FilesMatch>
</IfModule>
## Remove Apache and PHP version signature
<IfModule mod_headers.c>
Header unset X-Powered-By
</IfModule>
ServerSignature Off
## Prevent content transformation
<IfModule mod_headers.c>
Header merge Cache-Control "no-transform"
</IfModule>
##### Advanced server protection -- END
## Set the UTF-8 character set as the default
# Serve all resources labeled as `text/html` or `text/plain`
# with the media type `charset` parameter set to `UTF-8`.
AddDefaultCharset utf-8
# Serve the following file types with the media type `charset`
# parameter set to `UTF-8`.
#
# https://httpd.apache.org/docs/current/mod/mod_mime.html#addcharset
<IfModule mod_mime.c>
AddCharset utf-8 .atom \
.bbaw \
.css \
.geojson \
.js \
.json \
.jsonld \
.rdf \
.rss \
.topojson \
.vtt \
.webapp \
.xloc \
.xml
</IfModule>
##### Joomla! core SEF Section -- BEGIN
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteCond %{REQUEST_URI} !^/index\.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php [L]
##### Joomla! core SEF Section -- END
I appreciate some help. Thank you.