User blog comment:DaNASCAT/Technical Update: April 6, 2016/@comment-1251315-20160406203451/@comment-5558012-20160407131857

The WhatLinksHere problem could be linked to the link not appearing in the toolbar on file pages the last couple weeks.


 * "The problem affected me when I created a template on another wiki (getting a pointless "This server cannot handle the request right now" warning), but I was able to edit it normally as it submitted into the database."

I sent a report a couple days ago with a similar message when creating /doc pages. Likely a subpage issue. A refresh and the page can be published.