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Title
How to allow WMI through a firewall -
Description
Tasks that use WMI are failing to complete successfully when going through a firewall.
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Cause
The WMI service uses TCP port 135 to establish the communication endpoints, then starts to create connections at the lowest numbered port starting at port 1024. Over time, the port number that is used by WMI increases sequentially. The use of ports makes it difficult to allow this through a firewall.
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Resolution
For more information about how to statically map ports for the WMI service, click the following article number to view the article in the Microsoft Knowledge Base:
154596 (http://support.microsoft.com/kb/154596/ ) How to configure RPC dynamic port allocation to work with firewallÂOnce your server has been configured to use a static RPC port, you will need to configure your firewall to allow communication on this port.