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Most modern firewalls will have a "smart" feature that is network conversation aware, and will look at the WMI conversation and only allow the correct packets through.
Microsoft also offers a method to adjust the windows registry to fix and reduce the number of ephemeral ports used by WMI.
The first metod is certinky prefered if it is an option.
Thanks for the response Daniel.
Will run this through with our network security team and would update you then with what they have to say.
Be assured, i would assign the points accordingly.