I have tried some solutions given at http://support.microsoft.com/kb/332097/ but still I am not able to access internal website from any machine including the server. I am using the SBS 2003 Premium edition with ISA 2004. The error that I am getting is given below:
You are not authorized to view this page
You might not have permission to view this directory or page using the credentials you supplied.
If you believe you should be able to view this directory or page, please try to contact the Web site by using any e-mail address or phone number that may be listed on the companyweb home page.
Any help would be appreciated.