"Whenever I try to add an interwiki link by following the "Add link" link in the "Languages" section, the following error message pops up: "You need to be logged in. You need to be logged in on this wiki and in the central data repository to use this feature." However, if I visit Wikidata it seems I am already logged in there with my global login. This problem occurs not just with English Wikipedia but with other Wikipedias. Is this a known issue? Regardless, this error message is supremely unhelpful; it doesn't provide any indication as to what the "central data repository" is or how to log in there. —Psychonaut (talk) 17:43, 11 May 2013 (UTC)"
(Reported at http://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#.22You_need_to_be_logged_in.22_error_when_trying_to_add_interwiki_links)
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**Version**: unspecified
**Severity**: major
**See Also**:
https://bugzilla.wikimedia.org/show_bug.cgi?id=66521