Greetings,
After yesterdays maintenance on some specific regions we started to get 499 status code and as it was mentioned above the request key and response keys don't match. Everything was fine before yesterday for the past 2 years, same scripts, same php APIs/codes. If we restart the region everything starts working again as it should. Keys match and 499 status goes away. Everything turns back to normal. However, after a while (like 30 minutes, sometimes earlier sometimes a bit later than that) it stops working again and returns 499 codes with the keys not matching. Needing to restart 4 regions we have every 30 minutes or so is getting pretty annoying both for us and for thousands of players in our role playing system.