So, everything is changing and nothing remains the same:
"After many years of serving the needs of our users, and some more of declining usage in favor of better options, all public-facing debian.org FTP services will be shut down on November 1, 2017. These are:
ftp://ftp.debian.org
ftp://security.debian.org
This decision is driven by the following considerations:
- FTP servers have no support for caching or acceleration.
- Most software implementations have stagnated and are awkward to use and configure.
- Usage of the FTP servers is pretty low as our own installer has not offered FTP as a way to access mirrors for over ten years.
- The protocol is inefficient and requires adding awkward kludges to firewalls and load-balancing daemons."
More info/details here:
https://www.debian.org/News/2017/20170425