Hello,
We have an asset framework server where the 'PI Notification Service' is running. On this machine the status of the notification rule is shown with a green check mark indicating that the notification rule is in a running state.

We also have a engineering station, when I open 'PI System Explorer' on that machine and navigate to the same notification rule, the checkmark is grey.

Firewalls are enabled, maybe we need to open a port to retrieve this information? Anyone an idea?