问题
What is the difference between the following entry in web.config:
<sessionState timeout="30"/>
And this setting in IIS 7.5 (Default web site > Advanced Settings > Connection Limits) :
I know that the web.config is supposed to apply to the time that the ASP.NET session is kept alive, but what is the IIS setting for?
回答1:
The connection timeout is how long a connection from a browser to the server should take till it times out. So, when the browser requests a page/image/resource, how long should IIS wait till it terminates the connection. It is stated in seconds.
It can also be set in the web.config (example is for 2 minutes, 120 seconds):
<limits connectionTimeout="00:02:00" />
The session timeout is how long the session can live. This is across multiple connections and is stated in minutes.
They are two different settings that control different things.
回答2:
I think IIS is the default and if you want to override them, you use web.config:
http://technet.microsoft.com/en-us/library/cc754617%28WS.10%29.aspx
http://en.wikipedia.org/wiki/Web.config
来源：https://stackoverflow.com/questions/6922571/what-is-the-difference-between-web-config-timeout-and-iis-timeout