HTTPS Using Web Proxy

Hi Everyone,
I've just setup my ISA server's web proxy and tested it by changing my
web browser LAN settings to point to the ISA server. Everything is
working well on normal http traffic it records username and the website
they are visiting but when it comes to https traffic I get an error
message in the web browser:

Network Access Message: The page cannot be displayed
Technical Information (for Support personnel)
Error Code: 504 Proxy Timeout. The connection timed out. (10060)
IP Address: xxx.xxx.xxx.xxx
Date: 29/11/2006 15:14:12 [GMT]
Server: isa.mydomain.com
Source: proxy

I've played around with some settings but I can't get it to work.
Settings I've tried include:
On the internal network properties / Web proxy page I enabled SSL on
port 8443,
I added HTTPS to the same rule as HTTP is working on; I've tried
enabling the web proxy filter in the application filters part of the
HTTPS Protocol,
In Internet Explorer I've unchecked Use Same Proxy Server for All
Protocols and changed the Secure setting to use port 8443
But still no luck.
When I look in the logs for normal HTTP that works I get first line
says:

8080 http Denied connection Anonymous
http://www.website.com HTTP/HTTPS Rule
80 http Allowed Connection MyUserName
http://www.website.com HTTP/HTTPS Rule
8080 http proxy Initiate Connection
No Rule

More or Less and that works fine
But when i try to connect to a website using HTTPS the log looks like
this:

443 https initiate connection
No Rule
443 https Close connection
No Rule

Has Anyone got any suggestions I could try
Oh yeah I'm using ISA Standard 2006

Many thanks in advance

.

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