Tests hanging on private instance?

Hello,

I set up a private instance of WPT tonight using [0] in order to run a full site report on www.ubuntu.com using Andy Davies’ awesome spreadsheet tool. [1]

I think I managed to connect all the right wires but it seems like when my tests successfully initialise but then hang?

https://docs.google.com/spreadsheets/d/1ot6FEfuAusYzc4rlEszOQsmdWeqIah4mg3Pz70Mzg-I/edit#gid=0

According to the AWS panel, the server has successfully spun up a test agent.

https://p193.p3.n0.cdn.getcloudapp.com/items/wbumJeZx/Screenshot+2020-02-20+at+23.23.53.png?v=8d6116d885cfe0f09d97552d695c427f

Anyone any ideas?

[0] https://calendar.perfplanet.com/2014/webpagetest-private-instances-in-five-minutes/
[1] https://calendar.perfplanet.com/2014/driving-webpagetest-from-a-google-docs-spreadsheet/