Thanks so much. Really sorry I've been imposing on you.
So glad you found a write-up from Microsoft themselves on how to set up ICMP.
I too would prefer do it graphically, than through CMD. And hence, as you advised, I thought to take a day to do some reading on it. Because I am not much familiar with these Security Settings, Group Policy Settings part of Windows.
Yeah. That's true. I did completely disable the Firewall on all three domains, and still ping tpw.outages.io wouldn't go through.
But I did find that Windows Security > Firewall & Network protection > Allow an app through firewall (or) the same can be accessed at this path. Control Panel\System and Security\Windows Defender Firewall\Allowed apps. It shows a list of Apps and features that are running, and shows the ones that have been already allowed, across Public and Private networks. And I found that the Echo Network Service was already in the list, and was already permitted on both Public and Private Networks. I didn't do this. I saw that it was already allowed, and left it at that. Probably the Installer had set it up like that, because I had 'Run as Admin'. Would be great, if the Installer could also by itself check and set up this ICMP rule in Win10 Pro systems, wouldn't it. I mean, if this is a regular feature of Windows 10, and normal users would not need to dig in too much, isn't it.
Will read some articles, and set up the ICMP rules, and immediately post my feedback.
Thanks much.