How to set up SSL certificate (not self-signed) on virtual host on Ubuntu?

[stiuvert0007]

SSLCertificateChainFile /etc/apache2/ssl/tilabmx.com.ca-bundle <-- Worng

need to be pem,crt,cer

THanks Diablo now my conf file is:

PHP Code:

Listen 443

<VirtualHost *:443>
ServerName tilabmx.com
ServerAlias  www.tilabmx.com
ServerAdmin hcmarcos@tilabmx.com
DocumentRoot "/var/sentora/hostdata/zadmin/public_html/tilabmx_com"
php_admin_value open_basedir "/var/sentora/hostdata/zadmin/public_html/tilabmx_com:/var/sentora/temp/"
php_admin_value suhosin.executor.func.blacklist "passthru, show_source, shell_exec, system, pcntl_exec, popen, pclose, proc_open, proc_nice, proc_terminate, proc_get_status, proc_close, leak, apache_child_terminate, posix_kill, posix_mkfifo, posix_setpgid, posix_setsid$
SSLEngine on
SSLCertificateKeyFile /etc/apache2/ssl/tilabmx.com.key
SSLCertificateFile /etc/apache2/ssl/tilabmx_com.crt
SSLCertificateChainFile /etc/apache2/ssl/bundle.crt
SSLProtocol -All +TLSv1 +TLSv1.1 +TLSv1.2
SSLCipherSuite ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH:!A$
SSLHonorCipherOrder on
ErrorLog "/var/sentora/logs/domains/zadmin/tilabmx.com-error.log"
CustomLog "/var/sentora/logs/domains/zadmin/tilabmx.com-access.log" combined
CustomLog "/var/sentora/logs/domains/zadmin/tilabmx.com-bandwidth.log" common
<Directory "/var/sentora/hostdata/zadmin/public_html/tilabmx_com">
        Options FollowSymLinks Indexes
        AllowOverride All
        Order Allow,Deny
        Allow from all
</Directory>
AddType application/x-httpd-php .php3 .php
ErrorDocument 500 /_errorpages/500.html
ErrorDocument 403 /_errorpages/403.html
ErrorDocument 404 /_errorpages/404.html
ErrorDocument 510 /_errorpages/510.html
DirectoryIndex index.html index.htm index.php index.asp index.aspx index.jsp index.jspa index.shtml index.shtm
</virtualHost> 


But I get a 403 error. Why? I hope you can help me.
My site is https://tilabmx.com