It's very weird. Checked everything I could (I think), but I'm sure I'm overlooking something.
At this moment this is not urgent anymore, because we are going to reinstall the server with the OS and Plesk.
Maybe that solves the problem.
This is the situation:
Additional information:
OS - Ubuntu 14.04
Plesk - 12.0.8
mod_ssl is active in Apache2
Certificates are in place and checked in folder mentioned in httpd.conf
access_ssl_log:
x.x.x.x - - [22/Sep/2015:17:34:38 +0200] "GET / HTTP/1.1" 403 1343 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:40.0) Gecko/20100101 Firefox/40.0"
x.x.x.x - - [22/Sep/2015:18:02:57 +0200] "GET / HTTP/1.1" 403 1343 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:40.0) Gecko/20100101 Firefox/40.0"
x.x.x.x - - [22/Sep/2015:18:02:58 +0200] "GET /favicon.ico HTTP/1.1" 403 1342 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:40.0) Gecko/20100101 Firefox/40.0"
x.x.x.x - - [22/Sep/2015:18:02:58 +0200] "GET /favicon.ico HTTP/1.1" 403 1342 "-" "Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:40.0) Gecko/20100101 Firefox/40.0
error_log:
[Tue Sep 22 17:34:38.385520 2015] [ssl:error] [pid 27374] [client x.x.x.x:56845] AH02219: access to /var/www/vhosts/askrosana.com/httpdocs/ failed, reason: SSL connection required
[Tue Sep 22 18:02:57.424489 2015] [ssl:error] [pid 486] [client x.x.x.x:57270] AH02219: access to /var/www/vhosts/askrosana.com/httpdocs/ failed, reason: SSL connection required
[Tue Sep 22 18:02:58.072000 2015] [ssl:error] [pid 486] [client x.x.x.x:57270] AH02219: access to /var/www/vhosts/askrosana.com/httpdocs/favicon.ico failed, reason: SSL connection required
[Tue Sep 22 18:02:58.348648 2015] [ssl:error] [pid 486] [client x.x.x.x:57270] AH02219: access to /var/www/vhosts/askrosana.com/httpdocs/favicon.ico failed, reason: SSL connection required
httpd.conf
#ATTENTION!
#
#DO NOT MODIFY THIS FILE BECAUSE IT WAS GENERATED AUTOMATICALLY,
#SO ALL YOUR CHANGES WILL BE LOST THE NEXT TIME THE FILE IS GENERATED.
#IF YOU REQUIRE TO APPLY CUSTOM MODIFICATIONS, PERFORM THEM IN THE FOLLOWING FILES:
#/var/www/vhosts/system/askrosana.com/conf/vhost.conf
#/var/www/vhosts/system/askrosana.com/conf/vhost_ssl.conf
<IfModule mod_ssl.c>
<VirtualHost 85.214.28.143:443 >
ServerName "askrosana.com:443"
ServerAlias "
www.askrosana.com"
ServerAlias "ipv4.askrosana.com"
ServerAdmin "xxxxxxxxxxxxxxxxxx"
UseCanonicalName Off
DocumentRoot "/var/www/vhosts/askrosana.com/httpdocs"
CustomLog /var/www/vhosts/system/askrosana.com/logs/access_ssl_log plesklog
ErrorLog "/var/www/vhosts/system/askrosana.com/logs/error_log"
<IfModule mod_suexec.c>
SuexecUserGroup "askrosana" "psacln"
</IfModule>
<IfModule mod_userdir.c>
UserDir "/var/www/vhosts/askrosana.com/web_users"
</IfModule>
<IfModule mod_sysenv.c>
SetSysEnv PP_VHOST_ID "f2809be6-150c-44b1-a817-9ddb33d9893b"
</IfModule>
ScriptAlias "/cgi-bin/" "/var/www/vhosts/askrosana.com/httpdocs/cgi-bin/"
Alias "/plesk-stat" "/var/www/vhosts/system/askrosana.com/statistics"
<Location /plesk-stat/>
Options +Indexes
</Location>
<Location /plesk-stat/logs/>
Require valid-user
</Location>
Alias /webstat /var/www/vhosts/system/askrosana.com/statistics/webstat
Alias /webstat-ssl /var/www/vhosts/system/askrosana.com/statistics/webstat-ssl
Alias /ftpstat /var/www/vhosts/system/askrosana.com/statistics/ftpstat
Alias /anon_ftpstat /var/www/vhosts/system/askrosana.com/statistics/anon_ftpstat
Alias /awstats-icon /usr/share/awstats/icon
SSLEngine on
SSLVerifyClient none
SSLCertificateFile /opt/psa/var/certificates/cert-hlKhhb
SSLCACertificateFile /opt/psa/var/certificates/cert-SqkM6b
SetEnv PP_CUSTOM_PHP_INI /var/www/vhosts/system/askrosana.com/etc/php.ini
SetEnv PP_CUSTOM_PHP_CGI_INDEX module
<IfModule mod_fcgid.c>
FcgidInitialEnv PP_CUSTOM_PHP_INI /var/www/vhosts/system/askrosana.com/etc/php.ini
FcgidInitialEnv PP_CUSTOM_PHP_CGI_INDEX module
FcgidMaxRequestLen 134217728
</IfModule>
<Directory /var/www/vhosts/askrosana.com/httpdocs>
<IfModule mod_php4.c>
php_admin_flag engine on
# General settings
php_admin_value open_basedir "/var/www/vhosts/askrosana.com/:/tmp/"
# Performance settings
# Additional directives
</IfModule>
<IfModule mod_php5.c>
php_admin_flag engine on
# General settings
php_admin_value open_basedir "/var/www/vhosts/askrosana.com/:/tmp/"
# Performance settings
# Additional directives
</IfModule>
<IfModule mod_python.c>
<Files ~ (\.py$)>
SetHandler python-program
PythonHandler mod_python.cgihandler
</Files>
</IfModule>
<IfModule mod_fcgid.c>
<Files ~ (\.fcgi$)>
SetHandler fcgid-script
Options +ExecCGI
</Files>
</IfModule>
SSLRequireSSL
Options +Includes +ExecCGI
</Directory>
<Directory "/var/www/vhosts/system/askrosana.com/statistics">
AuthType Basic
AuthName "Domeinstatistieken"
AuthUserFile "/var/www/vhosts/system/askrosana.com/pd/d..httpdocs@plesk-stat"
require valid-user
</Directory>
Alias /error_docs /var/www/vhosts/askrosana.com/error_docs
ErrorDocument 400 /error_docs/bad_request.html
ErrorDocument 401 /error_docs/unauthorized.html
ErrorDocument 403 /error_docs/forbidden.html
ErrorDocument 404 /error_docs/not_found.html
ErrorDocument 500 /error_docs/internal_server_error.html
ErrorDocument 405 /error_docs/method_not_allowed.html
ErrorDocument 406 /error_docs/not_acceptable.html
ErrorDocument 407 /error_docs/proxy_authentication_required.html
ErrorDocument 412 /error_docs/precondition_failed.html
ErrorDocument 414 /error_docs/request_uri_too_long.html
ErrorDocument 415 /error_docs/unsupported_media_type.html
ErrorDocument 501 /error_docs/not_implemented.html
ErrorDocument 502 /error_docs/bad_gateway.html
ErrorDocument 503 /error_docs/maintenance.html
IncludeOptional "/opt/psa/admin/conf/file_sharing.conf*"
<IfModule mod_security2.c>
</IfModule>
</VirtualHost>
</IfModule>
Remaining part removed