SignalR not closing some connections

Question

My web app has online 200 users. But when I check SignalR connections after 1 day - it counts near 5000, most 2-10 hours long.

It starts okay, but grows 500 connections per hour. It seems like some connections just don't close.

And when I try to send message to all SignalR clients - my app hangs with CPU load 100%.

What can be the issue? SignalR version 2.2.0.

SignalR Connections

I moved SignalR functionality to new clean project. And it works till this day. — ZyXEL, Oct 27 '17 at 11:54
what tool is this? it looks like IIS but I don't think I ever set logging up properly — Simon_Weaver, Feb 03 '20 at 19:59
@ZyXEL thx - looks like I didn't have it installed https://stackoverflow.com/questions/15621509/how-do-i-see-currently-executing-web-request-on-iis-8 — Simon_Weaver, Feb 05 '20 at 20:18

score 0 · Answer 1 · answered Feb 05 '20 at 20:22

If you're using any kind of reverse proxy or tunnel between IIS and the public internet make sure everything is up to date.

For me it turned out to be due to using an out of date Cloudflare Argo tunnel.

1 Answers1