Collect OS metrics in Idera

I use idera for monitoring database servers but recently I noticed that some servers (no all of them) are not monitoring the disk part properly. The error I get is: TITLE: Monitored SQL Server Properties ------------------------------ The connection test failed. ------------------------------ ADDITIONAL INFORMATION: Error validating WMI connection: ------------------------------ Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED)) (mscorlib) ------------------------------ The tests I have executed are: Restart the winmgmt service Check the integrity of the repository Modify WMI rules in the firewall It is important to mention that the idera connection is made with a sql server user who has sysadmin permissions. Could you advise me about the permissions or configuration that could be missing, please?