Plesk WWW prefix - apache

Question

I'm having trouble with the WWW prefix for my domain. Whenever I goto the domain http://mydomain.com I get the correct index page. However, using the www prefix, I get the plesk default index page.
I have a subdomain called *.mydomain.com that points to it's parent httpdocs directory which is required for a url rewrite to our salespeople's profile pages (see below). There is also an alias for a completely different domain for mydomain.com (as you will see in last_httpd.include)
I can't seem to narrow it down. Commenting out the url rewrites in .htaccess didn't seem to work, neither did removing the *.mydomain.com subdomain.
I've provided what I can to perhaps give some insight to how things are setup. Thanks in advance for the help.
The www record in DNS is set as an A(host) record.
Here is the contents of my .htaccess file for the main domain. The domain name edited for obvious reasons...
#Gzip
<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x- javascript application/javascript
</ifmodule>
#End Gzip
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.mydomain.com
RewriteCond %{HTTP_HOST} ^(.+).mydomain.com
RewriteRule ^(.*)$ http://mydomain.com/agents/agent.php?agent=%1 [P,L]
My last_http.include file for the main domain in /var/vhosts/www/mydomain.com/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/mydomain.com/conf/vhost.conf
#/var/www/vhosts/mydomain.com/conf/vhost_ssl.conf
<IfModule mod_ssl.c>
<VirtualHost 10.10.10.10:443 >
ServerName "mydomain.com"
ServerAlias "www.mydomain.com"
ServerAlias "ipv4.mydomain.com"
UseCanonicalName Off
ServerAlias "mydomainalias.com"
ServerAlias "www.mydomainalias.com"
ServerAlias "ipv4.mydomainalias.com"
<IfModule mod_suexec.c>
SuexecUserGroup "mydomain" "psacln"
</IfModule>
ServerAdmin "admin#mydomain.com"
DocumentRoot "/var/www/vhosts/mydomain.com/httpdocs"
CustomLog /var/www/vhosts/mydomain.com/statistics/logs/access_ssl_log plesklog
ErrorLog "/var/www/vhosts/mydomain.com/statistics/logs/error_log"
<IfModule mod_userdir.c>
UserDir "/var/www/vhosts/mydomain.com/web_users"
</IfModule>
ScriptAlias "/cgi-bin/" "/var/www/vhosts/mydomain.com/cgi-bin/"
Alias "/plesk-stat" "/var/www/vhosts/mydomain.com/statistics"
<Location /plesk-stat/>
Options +Indexes
</Location>
<Location /plesk-stat/logs/>
Require valid-user
</Location>
Alias /webstat /var/www/vhosts/mydomain.com/statistics/webstat
Alias /webstat-ssl /var/www/vhosts/mydomain.com/statistics/webstat-ssl
Alias /ftpstat /var/www/vhosts/mydomain.com/statistics/ftpstat
Alias /anon_ftpstat /var/www/vhosts/mydomain.com/statistics/anon_ftpstat
Alias /awstats-icon /var/www/html/awstats/icon
SSLEngine on
SSLVerifyClient none
SSLCertificateFile /usr/local/psa/var/certificates/certQ69DPXb
SetEnv PP_CUSTOM_PHP_INI /var/www/vhosts/mydomain.com/etc/php.ini
<IfModule mod_fcgid.c>
FcgidInitialEnv PP_CUSTOM_PHP_INI /var/www/vhosts/mydomain.com/etc/php.ini
FcgidMaxRequestLen 16777216
</IfModule>
<Directory /var/www/vhosts/mydomain.com/httpdocs>
<IfModule mod_perl.c>
<Files ~ (\.pl$)>
SetHandler perl-script
PerlHandler ModPerl::Registry
Options ExecCGI
allow from all
PerlSendHeader On
</Files>
</IfModule>
<IfModule sapi_apache2.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/mydomain.com/:/tmp/"
php_admin_flag display_errors off
php_admin_flag log_errors on
php_admin_flag magic_quotes_gpc off
# Performance settings
php_admin_value memory_limit 64M
php_admin_value upload_max_filesize 256M
# Additional directives
</IfModule>
<IfModule mod_php5.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/mydomain.com/:/tmp/"
php_admin_flag display_errors off
php_admin_flag log_errors on
php_admin_flag magic_quotes_gpc off
# Performance settings
php_admin_value memory_limit 64M
php_admin_value upload_max_filesize 256M
# Additional directives
</IfModule>
<IfModule mod_python.c>
<Files ~ (\.py$)>
SetHandler python-program
PythonHandler mod_python.cgihandler
</Files>
</IfModule>
<IfModule mod_fcgid.c>
<Files ~ (\.fcgi)>
SetHandler fcgid-script
Options +FollowSymLinks +ExecCGI
</Files>
</IfModule>
SSLRequireSSL
Options -Includes +ExecCGI
</Directory>
<Directory "/var/www/vhosts/mydomain.com/statistics">
AuthType Basic
AuthName "Domain statistics"
AuthUserFile "/var/www/vhosts/mydomain.com/pd/d..httpdocs#plesk-stat"
require valid-user
</Directory>
Alias /error_docs /var/www/vhosts/mydomain.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
Include "/usr/local/psa/admin/conf/file_sharing.conf*"
</VirtualHost>
</IfModule>
<VirtualHost 10.10.10.10:80 >
ServerName "mydomain.com"
ServerAlias "www.mydomain.com"
ServerAlias "ipv4.mydomain.com"
UseCanonicalName Off
ServerAlias "mydomainalias.com"
ServerAlias "www.mydomainalias.com"
ServerAlias "ipv4.mydomainalias.com"
<IfModule mod_suexec.c>
SuexecUserGroup "mydomain" "psacln"
</IfModule>
ServerAdmin "admin#mydomain.com"
DocumentRoot "/var/www/vhosts/mydomain.com/httpdocs"
CustomLog /var/www/vhosts/mydomain.com/statistics/logs/access_log plesklog
ErrorLog "/var/www/vhosts/mydomain.com/statistics/logs/error_log"
<IfModule mod_userdir.c>
UserDir "/var/www/vhosts/mydomain.com/web_users"
</IfModule>
ScriptAlias "/cgi-bin/" "/var/www/vhosts/mydomain.com/cgi-bin/"
Redirect permanent /plesk-stat https://mydomain.com/plesk-stat
Redirect permanent /webstat https://mydomain.com/webstat
Redirect permanent /webstat-ssl https://mydomain.com/webstat-ssl
Redirect permanent /ftpstat https://mydomain.com/ftpstat
Redirect permanent /anon_ftpstat https://mydomain.com/anon_ftpstat
Redirect permanent /awstats-icon https://mydomain.com/awstats-icon
<IfModule mod_ssl.c>
SSLEngine off
</IfModule>
SetEnv PP_CUSTOM_PHP_INI /var/www/vhosts/mydomain.com/etc/php.ini
<IfModule mod_fcgid.c>
FcgidInitialEnv PP_CUSTOM_PHP_INI /var/www/vhosts/mydomain.com/etc/php.ini
FcgidMaxRequestLen 16777216
</IfModule>
<Directory /var/www/vhosts/mydomain.com/httpdocs>
<IfModule mod_perl.c>
<Files ~ (\.pl$)>
SetHandler perl-script
PerlHandler ModPerl::Registry
Options ExecCGI
allow from all
PerlSendHeader On
</Files>
</IfModule>
<IfModule sapi_apache2.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/mydomain.com/:/tmp/"
php_admin_flag display_errors off
php_admin_flag log_errors on
php_admin_flag magic_quotes_gpc off
# Performance settings
php_admin_value memory_limit 64M
php_admin_value upload_max_filesize 256M
# Additional directives
</IfModule>
<IfModule mod_php5.c>
php_admin_flag engine on
# General settings
php_admin_flag safe_mode off
php_admin_value open_basedir "/var/www/vhosts/mydomain.com/:/tmp/"
php_admin_flag display_errors off
php_admin_flag log_errors on
php_admin_flag magic_quotes_gpc off
# Performance settings
php_admin_value memory_limit 64M
php_admin_value upload_max_filesize 256M
# Additional directives
</IfModule>
<IfModule mod_python.c>
<Files ~ (\.py$)>
SetHandler python-program
PythonHandler mod_python.cgihandler
</Files>
</IfModule>
<IfModule mod_fcgid.c>
<Files ~ (\.fcgi)>
SetHandler fcgid-script
Options +FollowSymLinks +ExecCGI
</Files>
</IfModule>
Options -Includes +ExecCGI
</Directory>
<Directory "/var/www/vhosts/mydomain.com/statistics">
AuthType Basic
AuthName "Domain statistics"
AuthUserFile "/var/www/vhosts/mydomain.com/pd/d..httpdocs#plesk-stat"
require valid-user
</Directory>
Alias /error_docs /var/www/vhosts/mydomain.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
Include "/usr/local/psa/admin/conf/file_sharing.conf*"
</VirtualHost>

Answer 1

What is the http code response from server? You can check it in Firebug on "Net" tab.
Check that www.mydomain.com resolves to same IP as mydomain.com (nslookup www.mydomain.com)
check that apache's config is applied: apachectl -S / apache2ctl -S | grep www.mydomain.com