502 or 504 Bad Gateway or Gateway Timeout are communications errors, where the servers providing our web site service fail to exchange messages correctly with a user's computer.
These errors do not happen often, and are generally caused by unusually high levels of traffic through our web site. To date, they have only occurred just after an all-member email has announced new material on the web site, and been sent to too many members at the same time.
Sometimes, the error can be cleared by emptying the browser cache on the user's computer, then restarting the browser, but usually there is nothing the user can do except try later.
We recommend : Just try a couple of hours later, there is nothing very time-critical on the PARA web site!