Site loads but says timeout?

[pmeenan]

If I had to guess, there may be a critical request that the connections are failing for and the failed connections aren't showing up in the waterfall (maybe the origin for the failed requests has firewalled EC2 access). It should only cause a 20 second delay but if there are several then maybe it gets triggered multiple times.

A tcpdump should help in tracking down the connection (if that is the issue) and maybe comparing to a test run from a non-EC2 location will help display what the failed connection is.

It could also be doing something that is either confusing Chrome or the agent. The new Linux agents show a bunch of requests that never completed:

https://www.webpagetest.org/result/17051...view_step1

Possibly a problem with the HTTP/2 server or something else going on?