I am having the same issue. It's prompting for a username/password. Will not take my account and returns No data received - ERR_EMPTY_RESPONSE.
Same Issue - Just wondering since they are discontinuing certain web addresses lately for downloads, they are discontinuing the ftp also.
If that is the case, it will hamper some things on my end for my users.
I'm sending this to our web team to see if they have any more info on what happened.
Thanks for looking into it - I was able to access the ftp folders as normal as of this morning 7am CST.
I could also get in using Firefox/Mac and Chrome/Win, but was still asked for a password in Safari/Mac and Explorer/Win. Probably have to clear caches or something, but don't have the time right now.
Worked fine for me in IE - I haven't tried Safari, will have to try it later.