aspnet core and websocket limitations

Hi all, 

I am building an ASP.NET Core Websocket, using simple plain websocket integration. I also have a console app for load testing the websocket server. Creating ClientWebsocket connections work fine up until 5000. And it is always the 5000 limit. The next request doesnot reach the server, so might be an issue in the console app, or the request being blocked.

Any clues?

regards,

Riccardo