Windows Process Activation Service (WPAS)
Windows Process Activation Service (WAS) is a tool for managing worker processes that contain
applications that host Windows
Communication Foundation (WCF) services.
Worker processes handle requests that are sent to a Web Server for specific application pools.
Each application pool sets boundaries for the applications it contains.
The WAS process model generalizes the IIS 6.0 process model for the HTTP server by removing the
dependency on HTTP. This allows WCF services to use both HTTP and non-HTTP protocols in a hosting
environment that supports message-based activation and offers the ability to host a large number of
applications on a given machine.
WAS was first introduced in Internet Information Services
(IIS) 7 and is found in Windows Server 2008 R2. It runs most securely when on .NET Framework 3.5.1 or on IIS
7.0.
Contributor(s): Toni Boger
This was last updated in November 2012
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