Just installed x64 JDK 9.0.4 and Eclipse 4.7.2 on a new Win10 laptop. Eclipse works fine until I follow the instructions at https://developer.garmin.com/connect-iq/sdk/ to install the SDK, and attempting to add https://developer.garmin.com/downloads/connect-iq/eclipse/ as a software site results in nothing happening for several minutes and then a timeout message "HTTP Server 'Gateway Timeout': https://developer.garmin.com/downloads/connect-iq/eclipse/content.xml HttpComponents connection error response code 504."
I tried a couple of times about 24 hours apart, with the same error each time.