Difference between HTTP.SYS and WAS in IIS

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IIS

Hi can any one tell me the Purpose Of HTTP.SYS and WAS in IIS and Difference Between Them.

Thanks In Advance.

Posted 29-Dec-11 2:51am

madan b

Updated 29-Dec-11 4:05am

v2

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3 solutions

Solution 3

Find your answer here:
http://www.iis.net/learn/get-started/introduction-to-iis/introduction-to-iis-architecture#HTTP[^]

Posted 8-Sep-13 22:31pm

Tanumay99

Solution 4

Explanation is very precise and its true both the names are synonyms to each other earlier it used to called as Windows Activation Service as it used to activate services in IIS and now after IIS 6.0 onward it called as Web Activation Service. but both are doing the same task and purpose.

Posted 19-Jul-18 23:31pm

Member 13919455

Updated 19-Jul-18 23:37pm

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Richard Deeming 20-Jul-18 11:19am

SEVEN YEARS too late, and the question was already solved.

Stick to answering recent questions.

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Varun Sareen · Accepted Answer · 2011-12-29T04:05:00

Dear Madan,

HTTP.SYS is the kernel level components of IIS. All client request comes from client hit the HTTP.Sys of Kernel level. HTTP.SYS then makes a queue for each and every request for each and individual application pool based on the request.
Whenever we create any application pool IIS automatically registers the pool with HTTP.SYS to identify the particular during request processing.

WAS is a new feature of IIS, that allows all the features of the Windows Communication Framework stack, like non-HTTP channels and other stuff. IIS is the web server that hosts the services that are activated via WAS.

In case you mean Windows Activation Service: WAS - is the new process activation mechanism that ships with IIS 7.0. WAS builds on the existing IIS 6.0 but is more powerful because it provides support for other protocols besides HTTP, such as TCP and Named Pipes.

Don't forget to mark this as your answer if it clears your confusion.

Thanks