Unable to connect to internet while using 3D Warehouse and Extension Warehouse!

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I also made this longer post, that includes newer tips as well as the basic information about the URL that you are testing against:

SketchUp (desktop version) thinks you don't have an Internet connection

Do you have a typo here? Should the file path be SketchUp 2018 (not 2016) Could you also note in your original post that this issue can also affect extensions that require internet access for license activation and other online activities. As a developer, we typically use the command Sketchup.is_online to test whether there is a valid internet connection but the issue mentioned prevents this command from giving the correct result.