When I go to the warehouse 3D or Extensions this message pops up

[colin]

bing.com is a search engine, not a browser. It’s the address SketchUp uses to test whether you have an Internet connection. If for some reason your system blocks bing.com, then SketchUp will think you’re not online.

I wrote this topic about the problem, you could see if the work arounds I give help you:

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

Since about a month ago there has been an increase in the number of forum posts and support requests, where SketchUp is showing a message about how you need to have an Internet connection to do that feature. The features affected would include Add location, Generate Report, 3D Warehouse, and Extension Warehouse. It also would prevent you from being able to add a Classic license, or use an existing Network license. Some extensions may be affected too, if they rely on having an Internet connection…