I recently started using a VPN service while accessing Internet on all my computers (Specifically NordVPN). While the various network sites appear to work fine, I am unable to load the Stack Exchange Network Chat. Initially I shrugged assuming that the site was down.
However, after observing that this persisted for a long time, out of curiosity, I turned off VPN. And I was able to load the site fine.
I primarily use latest public build of Safari Version 12.1.2, on current public version of macOS Mojave 10.14.6. I was able to reproduce the issue with other popular Web browsers.
My question is, is this by design? If not, what could be possible causing the Chat site to not load while the various other SE sites work fine while on VPN.