What should I do if I get the message "No Data" for my .NET monitor

If you see the message "No Data" in your .NET monitor in APM Insight, log in to your respective server and open the APM Insight .NET Agent Healthmonitor tool from start menu. Check if any of the following messages are found in the Healthmonitor window, and use the corresponding actions to resolve the issue.

Message Cause Corrective action
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Could not connect to host  Server is behind proxy or uses outdated TLS version (versions below 1.2) for communication.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 plusinsight.site24x7.com 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 For outdated TLS versions, update to the latest .NET agent version.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] License key not given/License Expired/License Instance exceeded The limit on the number of advanced monitors has been reached, or there's been a delay in bill payments. Agent communication happens once every 15 minutes, so invalid licenses won't be reflected immediately.  Ensure you have sufficient advanced monitor licenses as well as the correct license keys, and navigate to the %ProgramData%\DotnetAgent folder to delete the apminsight.net.info file. Restart the agent.
[IIS Applications tab] Monitor in "Deleted" or "Marked for deletion" state Trying to add a monitor after deleting it in the Site24x7 console  Delete the apminsight.net.info file of the respective application in the %ProgramData%\DotnetAgent folder, and restart the APM Insight .NET Agent service (this will recycle the app pools). 
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