Receive error on opening: Tunneling socket could not be established, statusCode = 407


After installing the program and associated Git and R packages (I am running Windows 10), I get this error immediately upon opening the program.

I am working behind a firewall. Manually moving the repository folders from the C Drive to the local computer worked temporarily in opening the program long enough to create a project, but then the error returned.

Any advice would be greatly appreciated - many thanks!