Try setting up a basic REST connection to this API with Get option, no need to change any parameters:
If this works, it's a problem with the API your using, giving you the error message probably due to credential errors or so.
By the way, i'm testing it using the latest September patch and there's no 1.1 REST Connector version (I assume its a typo) the last connector version on official Qlik site is 1.0.
Hope it helps,
Hi Felip, thanks for your reply.
I tried to connect to your suggested API and I got the same error.
I set "Anonymous" and "Basic" with empty user/password fields.
One of the upgrades of Jun 2017 version is this new REST connector, see this "help" link: https://help.qlik.com/en-US/connectors/Subsystems/REST_connector_help/Content/1.1/Create-REST-connection/Create-REST-connection-Sense2.htm
I don't know what to do, this is very strange. Maybe is the "server certificate validation" or the "Trusted Locations", I have no idea. I tried to see the logs, but it was not helpful.