I frequently encounter this error when trying to import QFX files. I have discovered that I can switch from an Ethernet connection to WiFi and that appears to work. It is crazy that I have to uplug the Ethernet Cable, connect WiFi then try multiple times for this to upload.
But why does Quicken need to connect with the financial institution at all???
More about my Internet Connection: I am using a Dell XPS with a Docking Station. The Ethernet cable is plugged into the Docking Station (there is no Ethernet port directly on the laptop).