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How many concurrent requests can be executed in IIS 8.5?
I could not find proper values for how many concurrent requests can be executed in IIS 8.5
As I found out below 2 different values:
By default IIS 8.5 can handle 5000 concurrent requests as per MaxConcurrentRequestsPerCPU settings in aspnet.config
In machine.config, the maxconnection is 2 per CPU as default. So if have 6 core CPU then 12 concurrent requests are possible by default.
So I would like to know that Point 1 is right or Point 2 is right for concurrent requests for IIS 8.5.
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Has a maximum of 10 concurrent connections before an HTTP 403.9 error message is returned. HTTP 403.9 returns Access Forbidden: Too many users are connected.
In IIS I select my website and click "Advanced Settings" and in the Limits section there is a value called "Maximum Concurrent Connections" and that value is 4,294,967,295. In Performance Monitor, I add a counter under "Web Service" called "Maximum Connections" and this value is displayed on the graph as 1,138.
The easiest way to determine the number of active user sessions on the IIS Web site is to use the performance counters in Windows Performance Monitor. Open the Performance Monitor console by running the perfmon command and go the Performance monitor section (Monitoring Tools — > Performance Monitor).
Use this setting to limit the number of simultaneous client connections. The default value is 4294967295 .
According to this article there is also limitations when running on different Windows versions:
https://blogs.iis.net/owscott/windows-8-iis-8-concurrent-requests-limit
Max concurrent requests
Windows 8:
3 requests
Windows 8 Professional:
10 requests
Windows RT:
N/A since IIS does not run on Windows RT
I assumed (and tested on Windows 10 Home Edition) that on 8 and above this limitations still exists.
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