If the server requires encryption, a self-signed certificate can cause the connection to fail unless TrustServerCertificate is specified. Troubleshooting Steps

If the monitoring user lacks specific rights, it cannot retrieve system data. The user typically needs these permissions:

This issue typically stems from connectivity, configuration, or authentication problems between the monitoring agent and the SQL Server:

Are you using a (like Zabbix or Site24x7), or are you seeing this error in SQL Server Management Studio ? Microsoft SQL monitoring and integration with Zabbix

The specific mention of often implies a timeout or a system that is too busy to respond to non-critical monitoring queries.