The FTP download service at tug.ctan.org is back after an outage of a couple of days, caused by a security notice issued for the program that runs the downloads. Thanks to Rainer for the report and help with fixing the problem.
Ordinary users are not directly affected by this outage and reset. (Except, those mirror sites that rely on FTP may take a day to sync their entire holdings to this site and so a user trying to get quite recent material at a mirror may see a day's delay.)
I'll note that in the reconfiguration I've abandoned anonymous FTP uploads. Those days are gone.
Jim Hef{}feron Saint Michael's College