I had this same problem last night. I had a 90002, and then the launcher wouldn't run properly, showing that same error (the launcher was just a black screen instead of the news updates, etc). I noticed that website url in the error popup - if I tried to go to frontier.ffxiv.com on firefox it wouldn't load. I had to reset my router and then everything seemed to work fine again. I could also then go to frontier.ffxiv.com on firefox, though it was saying permission denied. I am in UK and with Sky, and this was about 11 pm. :-) This has never happened before, though I have been getting rubberbanding/lag ever since around the 14th-16th January. Very weirdly, it seems to get worse around late evening, and I'm assuming that's because more ppl are coming online in the US/Canada, etc.