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Can't access Remote Web Workplace from Internet - HTTP 403.6 error

I just configured a Dell PowerEdge 840 SBS 2003 server.  I ran the E-mail and Internet Connection Wizard, enabling everything EXCEPT "Server performance and usage reports" and "Business Web site (wwwroot)".   I can easily access the Remote Web Workplace from inside the network via https://server01/remote, however, I can't access it from an external machine.  I receive the dreaded "HTTP Error 403.6 ...you are trying to reach a list of IP addresses that are not allowed to access this web site." I researched this here at experts-exchange and tried the changes suggested in Microsoft KB306833 which has you change the directory security settings on the Default web.  This not only didn't work, but whereas I could previously ping the external IP address (the company does not have a static IP address, so we use a DynDNS.address), I can no longer ping it after making the IIS changes.  Additionally, I am using a WatchGuard Firebox Edge x10e, which has the appropriate ports opened.  What can I do to fix this mess so I can run Remote Web Workplace and once again ping the DynDNS address?
Thanks.
Michael
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msklein

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Your suggestion is exactly what the Microsoft KB306833 article describes. I tried it on the "default web site" and it didn't seem to change anything. It actually appeared to make things worse. I started to receive HTTP 404 errors afterwards.  Please keep in mind that we're not running a web site from the SBS; the business site is currently hosted by a hosting company. We're just trying to get OWA to work. What next?
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When I go to the "IP address and domain name restrictions" area of the Directory Security tab to remove the grants, I get an "Inheritance Overrides" for child nodes dialog box when I click "OK" after selecting the "allow access" radio button.  I have just been clicking "OK" without selecting any of them as that's what the MS KB article recommended.  Is that correct or do I need to select all or some of those, and if so, which ones?

I have the following web sites in IIS:
Default Web Site
Microsoft SharePoint Administration
SharePoint Central Administration
companyweb
WSUS Administration

Since I have made this change described above, I now get an HTTP 404 error when I try to access the RWW via https://<IP address>/server01/remote.  Any other ideas? Thanks.
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One more thing:
When I initially try to access the RWW via https://<IP address>/server01/remote, the browser returns 2 certificate related security warnings.  So it appears that it's getting to the IIS server, but failing at that point.  Also, if I ping the IP address, the ping fails.  However, if I ping the IP address with the port appended, e.g., "PING 123.456.789.012:443", I get a response.

Any other insights would be appreciated.  Thanks again.
Michael
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Hey, sorry about never replying to your latter comments, I never got the emails telling me comments had been added, weird! Just got the one about your comment today. Well done - very pleased that you've got it working - I've torn my hair out so many times with exactly the same faults before, super frustrating stuff. Have a good weekend.