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Microsoft Internet Information Services (IIS, sometimes called Server or System) is a set of Internet-based services for servers using Microsoft Windows. It is the world's second most used web server in terms of overall websites but is perhaps the most widely used web server for corporate websites. Originally, it was supplied as part of the server editions of Windows NT 4.0 and was upgraded accordingly with NT 4.0's subsequent service packs and option packs. Eventually, as IIS matured, it was integrated with Windows 2000 and Windows Server 2003.

The current version is IIS 6.0 and includes servers for FTP, SMTP, NNTP and HTTP/HTTPS and is only available for Windows Server 2003. Earlier versions also included a Gopher server. IIS 5.1 , a restricted version, that supports a limited number of connections is also supplied with Windows XP Professional. For Windows Vista clients, the local IIS 7.0 web server will change to not limit on connections but will limit workloads based on the active concurrent requests improving usability and peer-to-peer scenarios. Active Server Pages support began with IIS 3.0.

Versions

IIS 1.0, Windows NT 3.51
Service Pack 3
IIS 2.0, Windows NT 4.0
IIS 3.0, Windows NT 4.0
Service Pack 3
IIS 4.0, Windows NT 4.0
Option Pack
IIS 5.0, Windows 2000
IIS 5.1, Windows XP Professional
IIS 6.0, Windows Server 2003
IIS 7.0, Windows Vista
and Windows Server "Longhorn"

Security

Earlier versions of IIS were hit with a spate of vulnerabilities, chief among them which led to the infamous "Code Red worm"; however, the latest version of IIS, 6.0, has only that affect it. In IIS 6.0, Microsoft has opted to change the behavior of pre-installed ISAPI handlers, many of which were culprits in the vulnerabilities on 4.0 and 5.0, thus reducing the attack surface of IIS. With its next release, currently in beta and part of "Longhorn server", Microsoft goes a step further by modularizing many of the components, creating a stack from which you can pick and choose.

In versions of IIS before 6.0, all the features were run on the System account, allowing exploits to run wild on the system. Under 6.0 all request handling processes have been brought under a Network Services account which has significantly fewer privileges. In particular this means that if there is an exploit in a feature or custom code, it wouldn't necessarily compromise the entire system given the sandboxed environment the worker processes run in. IIS 6.0 also contained a new kernel HTTP stack (http.sys) with a stricter HTTP request parser and response cache for both static and dynamic content.

IIS 7.0

Debuting with Windows Vista, and also be included in Windows Server "Longhorn", IIS 7.0 will feature a modular. Instead of a monolithic server which features all services, IIS 7 will have a core web server engine. Modules offering specific functionality can be added to the engine to enable its features. The advantage of having this architecture is that only the features required can be enabled and that the functionalities can be extended by using custom modules.

The following sets of modules are slated to ship with the server: # HTTP Modules # Security Modules # Content Modules # Compression Modules # Caching Modules # Logging and Diagnostics Modules

[ Visit the complete Wikipedia entry for Internet Information Services ]

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