Installed VS2008 SP1, F5 no longer works for IIS websites

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Hi,
I've already posted at MSDN with no response.
If anyone has a clue, please let me know.
Environment: Windows Server 2003SP2 with IIS6, SQL Server Express, SQL
Server 2005, VS2005, VS2008
Last week I installed SP1 for VS2008.
I have several websites running on IIS6 on my machine. They contain both
server-side(ASP.NET 2.x and Perl CGI) and client-side (mostly JavaScript)
code.

Before installing the Service Pack, I was able to open an IIS Web in either
VS2005 or VS2008, set a breakpoint in any JavaScript location, hit F5 and
the page would open in IE with the breakpoint firing if it was hit.

After installation, the following messagebox appears after hitting F5:

"Unable to start debugging on the web server. An authentication error
occurred while communicating with the web server. Please see Help for
assistance."

The first time this happened, I checked the Help, and it instructed the user
to enable Integrated Windows Authentication (IWA), which is required for
debugging.

I went into IIS, and somehow all of the websites had been reset for only
anonymous access. So I rechecked to provide both Anonymous and IWA.
I also reset IIS.

However I am still getting the same message when I try to initiate debug
from within VS2005 or VS2008.

Note: I experimented with the sites by unchecking Anonymous Access and
leaving IWA checked. This made them completley inaccessible. When I did
this, it appears as if IWA failed.
When I attempted to access a site, a Login dialog appeared with the correct
Computer_Name/Username on top and a Password edit box underneath. When I
entered the password, the dialog would just reappear several times and then
an error page would appear in the browser.

My conclusion is that somehow IWA is no longer working for IIS. I don't know
how to fix it.
Is it possible to reinstall/repair IIS without uninstalling/reinstalling all
the apps that use it?

The web sites work fine on my intranet, and IWA is working fine when opening
an SQL server database.
I can still initiate "Start without Debugging" (ctrl+F5) from within VS.
Thanks,
Mike


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