How to handle up to 100k HTTP connections in .Net

Question

I am creating a server to monitor the online presence of clients on a webpage.

• There will be 80-100 000 (eighty thousand) simultaneous clients to monitor.

Answer 1

100 000 persistent connections is not a viable option.

Sending HTTP requests at interval is way more feasible, and writing a dedicated HTTP server is an interesting choice IMO.

Take a look at this question for some orientations.