How to allow for more than 5000 concurrent WebSocket connections in IIS 8 to a single Worker Process?

Question

I've created an asp.net app for work with WebSockets. I published my app on IIS 8 (server specs: 64GB RAM, i7 processor). I could open up to 5000 concurrent connections during testing. The server wouldn't open new connections after this limit has been reached.

I can open more connections if I increase the number of Worker Processes, but I'm wondering if I can do so with a single Worker Process.

score 8 · Accepted Answer · edited Dec 23 '22 at 10:30

I've successfully raised the per Worker Process limit to 50,000 by applying the following changes:

open cmd as Administrator and run:

%windir%\System32\inetsrv\appcmd.exe set config /section:system.webserver/serverRuntime /appConcurrentRequestLimit:50000

add the following block:
```
<configuration>
  <system.web>
    <applicationPool maxConcurrentRequestsPerCPU="50000" />
  </system.web>
</configuration>
```
to these files:
- %windir%\Microsoft.NET\Framework\v4.0.30319\aspnet.config
- %windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet.config

How to allow for more than 5000 concurrent WebSocket connections in IIS 8 to a single Worker Process?

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