You can try looking under the Confluence General Administration Pages, in the Users & Security section of the sidebar there is a "Whitelist" option.
That topic does not show under my 'Users & Security' section.
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What options do you see under that section? On two of my Confluence Server instances, 5.9.x and 6.4 the section appears.
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Discovered that I do not have permissions to update whitelist. Another user is able to access.
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