Unable to access HTTPS sites

ISA 2006 Standard Edition on Windows Server 2003 R2 SP2
Both OS and ISA have the latest patches. ISA has 2 NICs, internal and
external (with a real IP address)

Problem: HTTPS site are not accessible

Example: accessing www.bankofamerica.com gives me to the following error:

Network Access Message: The page cannot be displayed
Technical Information (for Support personnel)

* Error Code: 502 Proxy Error. The ISA Server denied the specified
Uniform Resource Locator (URL). (12202)
* IP Address: 10.1.1.1
* Date: 11/18/2008 10:47:51 PM [GMT]
* Server: isaserver.ourdomain.com
* Source: proxy

More information about my ISA 2006 settings. I created a WebProxy rule with
the following settings:

Action: Allow
Protocols: HTTP and HTTPS
From: Internal
To: External
Users: user-created group containing my Windows 2003 AD account
Schedule: 24/7

Content types settings:
- if I choose All Content Types, I can access https sites without any
problem
- if I choose Select Content Types (with this option, the rule is applicable
only to HTTP traffic), I can't access HTTPS sites. Selecting all of default
content types under "Select Content Types" does not make any difference. I
still can't access HTTPS sites.

I can only access HTTPS sites if I choose All Content Types but there's a
problem. I want to restrict users ability to download executables. All
content types allows me to download everything. That's not what I want.

I don't know where to begin troubleshooting.


.

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