Visit https://incubator.wikimedia.org/wiki/Wp/fa.
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That's weird, something must have changed on MediaWiki's side. It was working fine in March 2015 and there were no changes made since then.
Are there any error logs available for us to have a look on Wikimedia's end?
Should be fixed once https://gerrit.wikimedia.org/r/#/c/347010/ is deployed to production.