求助：apache 的虚拟主机SSL如何配置？

enta

/usr/local/apache/conf/extra/httpd-ssl.conf
内容：
<VirtualHost _default_:443>
【修改后】DocumentRoot "/home/www/default"
【新增加本行】DirectoryIndex index.html forum.php index.php
ServerName www.example.com:443
ServerAdmin you@example.com
ErrorLog "/usr/local/apache/logs/error_log"
TransferLog "/usr/local/apache/logs/access_log"
SSLEngine on
SSLCertificateFile "/usr/local/apache/conf/server.crt"
SSLCertificateKeyFile "/usr/local/apache/conf/server.key"
<FilesMatch "\.(cgi|shtml|phtml|php)[        DISCUZ_CODE_15        ]quot;>
    SSLOptions +StdEnvVars
</FilesMatch>
<Directory "/usr/local/apache/cgi-bin">
    SSLOptions +StdEnvVars
</Directory>
BrowserMatch "MSIE [2-5]" \
         nokeepalive ssl-unclean-shutdown \
         downgrade-1.0 force-response-1.0
CustomLog "/usr/local/apache/logs/ssl_request_log" \
          "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"

</VirtualHost>


IP访问正常，如果随便配置一下虚拟主机，就500 Internal Server Error
虚拟主机该如何配置？