I am using longhorn for my k3s cluster. My cluster is in a completely different environment than my local computer. The setup for accessing the dashboard looks like this.

Local PC (env1) <-> Reverse Proxy (env1, IIS6) <-> Reverse Proxy (env2, IIS8) <-> K3s Cluster (env2 nginx ingress) <-> Longhorn dashboard (env2)

This setup works fine for most of my apps. Like Kubernetes dashboard, graylog, some self developed stuff etc.

But longhorn is reloading stuff so many times, that all ephemeral windows ports on the first Reverse Proxy are getting occupied. And then, no other connection to the server is possible anymore. Also closing all ports needs a restart of IIS. Also then, getting all connections closed needs some time. So it is creating a high pressure on the server.

My question is, is there something wrong with my IIS configuration? I am using ARR on IIS 6. It is a default configuration, nothing special. Done on the user interface with the URL Rewrite module.

Or is there a setting for longhorn, where i can disable the relaod of the page?

Here is a screenshot of my browser. As you can see, many requests are sent to the server: