Similar to T164553, EBSCOhost is a major, paywalled database. Its archived pages always link to a login screen. Some of the links (those with db=a9h, for instance, which were 15% of the results) do redirect in-browser to an abstract of the cited article, but their archived links do not.
http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=5331234&site=ehost-live will resolve but
So the search.ebscohost.com domain should be whitelisted ("treats the URL as alive and locks it in that state so it cannot be modified by the bot")
Happy to assist with stuff like this, especially as the whole ebscohost.com domain needs some configuration, but I think whitelisting/blacklisting full domains requires a user right, if it didn't before