In Security documentation, in Kerberos authentication page, under section on 'Operational Considerations', the first section is 'HTTP Console': http://docs.mongodb.org/manual/core/kerberos/#the-http-console
This has a one line description where the text 'HTTP Console' is linked to http://docs.mongodb.org/ecosystem/tools/http-interface/#http-console. Clicking this gives a '404 Not Found' error.
Digging around, looks like the correct link now is http://docs.mongodb.org/ecosystem/tools/http-interfaces/#http-console
I wonder why the plural for http-interface though...