No Agents Connected error

WebPageTest Private Instances
1

I am trying to setup a WPT setup using the Amazon AMIs on us-east region. I have the instances up but, verifying on the /install/ shows me an error like this:

us-east-1-group : US East (N. Virginia)
   us-east-1 : US East (N. Virginia) - No Agents Connected
   us-east-1_IE11 : US East (N. Virginia) - No Agents Connected

Here’s what I have in my locations.ini

[locations]
1=us-east-1-group
default=us-east-1-group

[us-east-1-group]
1=us-east-1
2=us-east-1_IE11
label="US East (N. Virginia)"
default=us-east-1

[us-east-1]
browser=Chrome,Firefox
label="US East (N. Virginia)"
region=us-east-1
size=c4.large

[us-east-1_IE11]
browser=IE 11
label="US East (N. Virginia)"
region=us-east-1
size=c4.large

This is what I see in my access.log:

172.31.49.252 - - [27/Jul/2020:18:28:12 +0000] "GET /work/getwork.php?f=json&shards=1&reboot=1&location=us-east-1&pc=...&ec2=..&ec2zone=us-east-1e&version=200722.170732&screenwidth=1920&screenheight=1200&freedisk=9.759&upminutes=19 HTTP/1.1" 200 31 "-" "python-requests/2.24.0"

Am I making some mistake that is causing the error? Please could someone take a look and let me know.

Thanks,
Akshay