Rest connection problem

[Username]

Hi,

I have a problem with a REST connection. Internet access is restricted on my Qlik Sense server. So i need to open some ports or make a connection tunnel for the REST connection. The problem is that i cannot test the connection. When i try to make a connection, the connection window is blank and there is just a small loading icon (bottom left).

Is the connection menu blank because of no internet access and if so, which ports i need to open or which settings i need to change for the application to work? Picture from blank Create new connection menu below:

ODBC and OLE DB connection menus are not blank and i have actually successfully created a connection with both ODBC and OLE DB so something is different with the REST connection.