I swear the B'stards do it on purpose when we run these Mocks.
Reading around the problem is on their end:
Server overload - a server can crash if it has exhausted its memory, due to a multitude of visitors on site or a DDOS attack. CANT BE THE NUMBER VISITORS SURELY, OUR MOCKS AREN'T THAT POPULAR ARE THEY?!
Firewall blocks a request - a firewall may block communications between an edge server and upstream server. Some DDoS protection systems can over-react and block requests from a content delivery system. NO IDEA
Faulty programming - sometimes an error in a website’s code may mean that requests cannot be answered correctly, prompting this error to show up. MORE THAN LIKELY GIVEN THE **** DISASTER ITS BEEN IN RECENT YEARS