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Getting Error Code: 502 Proxy Error

We have an SBS 2003 network with 10 users running ISA Server 2004. When one of my users tries to acces a certan website with Https, they get the following error:
Error Code: 502 proxy Error. Connection refused (10061)
IP Address: XX.XXX.XX.XX
Date: 3/11/2011  2:55:15 PM
Source: proxy

This is the only web site this user can not access. She has been configured for full internet access. The strange thing is as follows. When she logs onto another computer, she has no problem getting to the secure web site. Also, when another user logs onto her computer, they can access the web site. I am baffeled.
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1 Solution
Possible solution:

ok open the the user Internet Explorer ->Tools -> Internet Options -> Advanced -> Scroll down until you find security make sure ssl 2.0 and ssl 3.0 are checked.

another possibility:
1.go to internet property
3.Lan Settings.
5.Un-Check (Use the Same proxy server for all protocols.
6.Remove ip & port from SECURE.
and then check website (https).

Keith AlabasterEnterprise ArchitectCommented:
Are you using roaming profiles? If the fault is only seen on this one PC and for that one users local profile then delete the profile and let it get recreated when that user logs on again to that machine.
csk2512Author Commented:
This is not a roaming profile. If I delete the users profile, won't she lose all her desktop shortucts and files associated with her profile? Also, in order to delete the profile, i logged in as administrator and found (2) user profiles under Control Panel, user accounts. Do I delete both? Let's say her name is Susan. The (2) accounts are listed as follows:

Susan and the Domain name
Susan and the Computer Name
Would I delete both?
Keith AlabasterEnterprise ArchitectCommented:
susan.computername is a local copy created by a user logging in with the computer account rather than the domain account. The susan.domain is thew domain account.

Depending on whether you are roaming or not will depend on whether anything gets lost or not but the fact it works if you use someone else's profile on the PC shows that somnething is corrupted.
If the susan user's profile works OK on a separate machine, you can delete her profiles on this non-working machine and copy it over again from a working machine.
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