Out of curiosity: what error are you seeing? That site appears to be running on an Amazon IP (on my traceroute, in the block https://ipinfo.io/AS16509/52.223.4

Out of curiosity: what error are you seeing? That site appears to be running on an Amazon IP (on my traceroute, in the block https://ipinfo.io/AS16509/52.223.48.0/20 https://ipinfo.io/AS16509/52.223.48.0/20). If it didn't load immediately, I wonder if you got unlucky enough to catch an autoscaler napping (or maybe they aren't autoscaling; sometimes dodging the hug of death completely isn't worth the cost, depending on how cost-sensitive a firm is). (ETA: However, the DNS entry is willing to give some wildly different IPs for the lookup, and at least one of them appears to be flagged as abusive, so if you're behind a corporate firewall it's possible an auto-protector is blocking you).