https://subeta.net/quests.php/carl Make sure the link above is the link you are going to. Some old bookmarks/links may have an incorrect one. I was just able to do a quest.

Can you try to take out one of the carl/ and that should work. I have no idea why it is directing you to that link

I dunno either but I just know it looked weird xD I'll leave this open for the day in case you get it again.

Pretty sure these 504 errors have ended since this report. If you're still experiencing them just let me know. :)