It doesn't help to disable the WMI part of the monitoring because the underlying problem is with DCOM on which WMI and remote registry are built. Whilst you could disable WMI, disabling remote registry would remove much of the productâ€™s usefulness.
In order for monitoring to succeed, the following network traffic needs to be opened up (see http://support.microsoft.com/kb/832017/en-gb
Ports 49152-65535 (for Windows Server 2008 or later)
Ports 1023-5000 (for Windows Server 2003 or earlier)
These are all covered by the following Windows Firewall rules/exceptions:
All ICMP v4
File and Printer Sharing
Windows Management Instrumentation (WMI)
I hope that is of some help.