I don't have any error in Apache error log on my website.
I send you the Apache web log:
during installation:
Code:
66.249.92.125 www.web_site.com - [09/Aug/2014:12:45:11 +0200] "GET /forum/rss?format=feed HTTP/1.1" 503 415 "-" "Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 4 subscribers; feed-id=6762360829903086996)"
66.249.92.125 www.web_site.com - [09/Aug/2014:12:46:11 +0200] "GET /forum/rss?format=feed HTTP/1.1" 503 415 "-" "Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 4 subscribers; feed-id=6762360829903086996)"
66.249.92.21 www.web_site.com - [09/Aug/2014:12:47:12 +0200] "GET /forum/rss?format=feed HTTP/1.1" 503 415 "-" "Feedfetcher-Google; (+http://www.google.com/feedfetcher.html; 4 subscribers; feed-id=6762360829903086996)"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:17 +0200] "POST /administrator/index.php?option=com_installer&view=install HTTP/1.1" 303 26 "http://www.web_site.com/administrator/index.php?option=com_installer" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:26 +0200] "GET /administrator/index.php?option=com_installer&view=install HTTP/1.1" 200 7593 "http://www.web_site.com/administrator/index.php?option=com_installer" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /plugins/installer/webinstaller/css/client.min.css?jversion=3.3.3 HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/jui/js/jquery.min.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/jui/js/jquery-migrate.min.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /administrator/templates/isis/css/template.css?718a569220f0b620c47ce2c8aeceaaa7 HTTP/1.1" 200 27042 "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/system/js/tabs-state.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/jui/js/bootstrap.min.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/jui/js/jquery-noconflict.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /plugins/installer/webinstaller/js/client.min.js?jversion=3.3.3 HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /administrator/templates/isis/js/template.js?718a569220f0b620c47ce2c8aeceaaa7 HTTP/1.1" 200 782 "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/system/js/mootools-core.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /media/system/js/core.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:27 +0200] "GET /administrator/templates/isis/favicon.ico HTTP/1.1" 304 - "-" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:12:51:28 +0200] "GET /administrator/templates/isis/images/logo.png HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_installer&view=install" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
65.19.138.34 www.web_site.com - [09/Aug/2014:12:54:37 +0200] "GET /wiki/feed.php HTTP/1.1" 404 760 "-" "Feedly/1.0 (+http://www.feedly.com/fetcher.html; like FeedFetcher-Google)"
during the access to the Kunena component for update
Code:
82.225.135.45 www.web_site.com - [09/Aug/2014:13:03:57 +0200] "GET /administrator/ HTTP/1.1" 200 5647 "-" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:13:04:14 +0200] "GET /administrator/index.php?option=com_kunena HTTP/1.1" 200 3306 "http://www.web_site.com/administrator/" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
82.225.135.45 www.web_site.com - [09/Aug/2014:13:04:15 +0200] "GET /media/system/js/mootools-more.js HTTP/1.1" 304 - "http://www.web_site.com/administrator/index.php?option=com_kunena" "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0"
Can it help you?