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Server Properties: General :
It lets you specify which remote consoles and servers have access to the management server.
You can configure the following options:
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Allows all computers to communicate with the management server.
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Blocks all computers from communicating with the management server
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Except those in the list below
Specifies the exceptions to the computers that have been granted or denied access globally. An exception is defined by the IP address of a single computer or the subnet mask of a group of computers. The list of exceptions automatically denies access if you granted access to all consoles and servers. The list of exceptions automatically grants access if you denied access to all consoles and servers.