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We have SignalR Core running in IIS and the connections are not being closed over time.

This results in a 503 error:

HTTP Error 503.2 - Service Unavailable
The serverRuntime@appConcurrentRequestLimit setting is being exceeded.

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When recycling the apppool the Current Connections will drop to 0 and then back up to around 50 (as actual clients reconnect). Over the course of a day it can easily reach 2000. Not every connection is leaking - the number does decrease but trends upwards over time.

Latest .NET Core 3.1 is installed.

Simon_Weaver
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1 Answers1

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We are using Argo Tunnel which creates a tunnel from our webserver to the Cloudflare network.

Turns out it was an out of date cloudflared executable.

The version we were running was from 5/2019 and updating to the new version from 12/2019 has fixed the problem. In fact when stopping the cloudflare service all the connections instantly dropped away.

Simon_Weaver
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