デフォルトの証明書が邪魔をしているようで、
https://ssltools.websecurity.symantec.com/checker/views/certCheck.jsp
で忠告される。ただし、デフォルトの証明書のおかげな部分もある。
You have 1 error
Multiple certificates were found with the same common name.
The certificate installation checker cannot determine which certificate is correct. Remove the incorrect certificate and try again.
Recommendations
Root installed on the server.
For best practices, remove the self-signed root from the server.
Update your certificate chain.
Your certificate chain is valid, but some older browsers may not recognize it. To support older browsers, download and install the missing intermediate certificate
下記ではB判定、ブラウザのカバー率が低い。10.6サーバはC判定、上記のチェックツールはOK。ただし This server may be vulnerable: SSLv3 is enabled。