Agent service not running
Can be contributed to various factors like antivirus software stopping the service or user stopping the service.
Start the APM Insight .NET agent service (this recycles the app pools), and perform some transactions.
Could not connect to host
Server is behind proxy or uses outdated TLS version (versions below 1.2) for communication.
Edit the proxy settings in the APM Insight .NET Agent configuration window and verify the connection to Appmanager server on a browser. For outdated TLS versions, update to the latest .NET agent version.
Profiling environment variables not set
A competing profiler has been installed.
Navigate to the Tools tab, and click Repair Installation. Uninstall any competing profilers and restart the APM Insight .NET Agent service (this will reset IIS).
No. of apps included for monitoring -0
Applications to be monitored are not configured in APM Insight .NET Agent configuration window or new applications were added after configuration.
Open the APM Insight .NET agent configuration window and navigate to the Applications tab. Select the applications to be monitored, and click Save. This recycles the respective app pools.
[IIS Applications tab] Monitor in "Deleted" or "Marked for deletion" state
Trying to add a monitor after deleting it in the Appmanager server
Delete the apminsight.net.info file of the respective application in the %ProgramData%\DotnetAgent\<APPLICATION_NAME> folder, and restart the APM Insight .NET Agent service (this will recycle the app pools).