Hi,
It seems that you encounter the following issue:
Blank page or page cannot be displayed when you view SSL sites through ISA Server or Microsoft Forefront Threat Management Gateway, Medium Business Edition
http://support.microsoft.com/kb/283284
Please ensure that you implement the SSL, install the certificate, then check if SSL connectivity is working on the Web Server, you can refer to the following
KB:
HOW TO: Determine If SSL Connectivity Is Not Working on the Web Server or on an Intermediate Device
http://support.microsoft.com/kb/290051
Meanwhile, try to enable SSL for all customers who interacts with your web site.
How to enable SSL for all customers who interact with your Web site in Internet Information Services
http://support.microsoft.com/kb/298805
Best Regards
Dale
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