Internet Information Services (IIS) 6.0 is a complete Web server available in all versions of Windows Server 2003. Designed for intranets, the Internet, and extranets, IIS 6.0 makes it possible for organizations of all sizes to quickly and easily deploy powerful Web sites and applications. In addition, IIS 6.0 provides a high-performance platform for applications built using the Microsoft .NET Framework.
In-place upgrades to IIS 6.0 from IIS 4 and IIS 5 occur automatically with Windows Server 2003. For moving a Web site that is running on IIS 4 or IIS 5 to a clean installation of Windows Server 2003 on another machine, use the IIS 6.0 Migration Tool (IISMT). The IISMT is a command-line tool that automates many of the manual steps involved when moving an application, including transferring configuration data and Web site content to the new server and converting many of the application's settings to their IIS 6.0 equivalents.
To troubleshoot your IIS6.0 issue, please search your topics in the Microsoft KB from following links with proper products.
Microsoft Windows Online Support