Run this script on your SQL Server to ensure the Zabbix user has the minimum required access:

Check the Zabbix Agent logs on the Windows MSSQL host ( C:\Program Files\Zabbix Agent\zabbix_agentd.log ). You will likely see:

Navigate to Administration > Queue > Queue Details in the Web UI. This shows exactly which items are delayed and for how long, helping you identify if the issue is a single item or the entire plugin. Microsoft SQL monitoring and integration with Zabbix

SELECT session_id, login_name, status, last_request_start_time, last_request_end_time, text FROM sys.dm_exec_sessions s OUTER APPLY sys.dm_exec_sql_text(most_recent_sql_handle) t WHERE login_name = 'zabbix_user';