Even i', facing the same problem. any help is appricehated. I can understand that we need to change the setting to point the Rest connector to point to proxy server, not able to find where to change the setting.
Until this is resolved, i have found a workaround by using the "General Web Connector" from the "Qlik Web Connector tool". Worked for my JSON issue. (It was solved because in the Qlik Web Connetor tool, it is possible to set the Proxy settings.)
Yes. This connector will work for both Qlikview and Qlik Sense. It's a separate licence and it is not free like the REST connector. Luckily in my case, my customer already had this license...
I attach a informative PDF with more info about the tool.
The connector I use in this set is called "General XML/JSON/SOAP API " - and sometimes also refered to as "General Web Connector". Orginally this was a external tool delivered by a Company called QVSource, that was aquired last year by Qlik and is now sold through Qlik.
It is much more complicated to work with than the REST connector, and requires a separate installation, but then again it can do much more than the REST connector...
I hope the REST connector will soon allow a Proxy server. Has this been reported to Qlik as a bug?