The client is correctly configured, as I can use the {{#statements}} parser function on nonbinarywiki to retrieve stuff from specific nbdbwiki items. However, I can't link articles from nonbinarywiki to items in nbdbwiki, which is (I think) the last thing I need to be changed. I believe that the solution is adding nonbinarywiki as a site identifier in the nbdbwiki, as this is the error I get when I try to link an article from the client wiki (using the Add link button in the sidebar). I have looked in nbdbwiki's ManageWiki interface but I can't seem to find the option.