If you want to do agentless monitoring of a Windows 2003 host, you need to configure WMI to allow remote querying.

Open Computer Management (Administrative Tools). Expand Services and Applications. Right-click WMI Control, then click Properties.

Select the Security tab, click the Root namespace, then click the Security button at the bottom.

Add the user that will need access to WMI. This is usually the service account running the System Center agent on the host that will monitor this host.When adding the account, be sure to allow for Remote Enable.

If Windows Firewall is in use, you also have to allow for remote management:

Open a command prompt.

Type the following to allow remote mana  ...