IIS6 - SBS 2003 - HTTP Error 403.6 - IP Address Rejected After P2V

Hello All,

We virtualized SBS 2003 and we are getting an error message " HTTP Error 403.6 - IP Address Rejected" when we try browsing the specific site using FQDN, NETBIOS name or IP address:

Fails:

1. http://ServerName.domain.local/sitename
2. http://ServerName/sitename
3. http://10.10.10.10/sitename

Works

1. http://localhost/sitename
2. http://ServerName.domain.local/
3. http://ServerName/
4. http://10.10.10.10/

Troubleshooting which did not fix the issue:

1. The location of the site is C:\Inetpub\wwwroot\sitename.
2. Followed KB248043 "Error Message: 403.6 - Forbidden: IP address rejected" http://support.microsoft.com/kb/248043  and manipulated with the content of the IP Address and Domain Name Restrictions lists.
3. Step 1, but with the regards to How to Restrict Access by IP Address on a Receiving Bridgehead Server http://technet.microsoft.com/en-us/library/aa996651(v=exchg.65).aspx, because SBS 2003 has Exchange on it.
4. Exported and imported of the website using WebDeploy tool to Windows 2003. Upgraded it to Windows 2008 R2. ApplicationHost.config contains <ipSecurity allowUnlisted="true" />
5. Used ProcMon to investigate the difference between LOCALHOST and NETBIOS name access, but does not know what to look for.

Would you be so kind to advise where to look at and what to do?

Thank you very much for your time and attention in advance!