From Confluence version 2.8 the 'External User Test' tool is integrated into the Administration Console, and you can also run it outside of Confluence. In previous versions of Confluence, this tool was available only as a separate utility called 'Paddle'.

The Atlassian-User optional setting useUnqualifiedUsernameForMembershipComparison is not supported by Paddle, so the tests may not be correct if this option is being used. In this case, the Connectivity test must can be done using Confluence.