Late answer but I get this error message when I enter a wrong identifier of a Custom Authenticator in the datasource config.

So I found the issue, but still not really sure as to why..We had a /etc/map configuration where we hide the /content path on the publishing servers, the problem was that this caused the url to be rewritten during the call sequence to the publish server, hence /etc.clientlib gave a 404, however I do not understand why it was rewritten for anonymous users but when logged in it worked fine, still checking. When I also applied read access for the group everyone to the /etc path everything worked fi...