I tried accessing it in firefox with a laptop.
I'm able to access the site fine but when I go to game settings I get:
"The requested URL /flexidice/config.html was not found on this server."
Wonder if this is related to your issue somehow.
Nope. It is not related.
I started game setting button in Dev env and for some typo, I had to upload new corrected version to prod and I guess, non-working game setting button slipped through. Corrected now. Thank you.
Now, SSL certificate issue:
As per
https://startssl.com/Support?v=25#31 I have added the intermediate CA certificate to server's CA-Trust. It should be working now. Would you please check it and let me know if otherwise. Thank you.