I am working on a windows 2003 server to allow outside client's to access a catalogue that is stored on the server. When I navigate to the page on the internet I get the following message: You are not authorized to view this page
The Web server you are attempting to reach has a list of IP addresses that are not allowed to access the Web site, and the IP address of your browsing computer is on this list.
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Please try the following:

Contact the Web site administrator if you believe you should be able to view this directory or page.
HTTP Error 403.6 - Forbidden: IP address of the client has been rejected.
Internet Information Services (IIS)

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Technical Information (for support personnel)

Go to Microsoft Product Support Services and perform a title search for the words HTTP and 403.
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled About Security, Limiting Access by IP Address, IP Address Access Restrictions, and About Custom Error Messages.

Could you please let me know how to correct this problem?

Thank you in advance for your help.

Is the server visible on the public side of the Internet? Are you using IP Address Restrictions in IIS? How is the catalog being published? Is it available by FTP?