gistfile1.txt

Yes, ftp.ruby-lang.org is down.

You can find more information at http://www.ruby-lang.org/en/news/2013/08/06/status-issue/ and https://github.com/ruby/www.ruby-lang.org/issues/259

In the meantime, you can find a mirror at http://mirrorservice.org/sites/ftp.ruby-lang.org/pub/ruby/ , but do note the instructions on the link above about making sure you have something safe:

"If you decide to download Ruby from one of various mirrors, please be vigilant and verify the MD5 checksums of any files you download match MD5 checksum in the release notes for that version. Obviously, you should also verify that the release notes are coming from a trusted source. We have no reason to believe that www.ruby-lang.org was compromised (it runs on different hardware than ftp.ruby-lang.org) but it’s worth double-checking the release notes against the oldest version you can find on archive.org, just to be safe."

How to make rvm work under these conditions, version 1; easy but takes a while because git download is huge:

Pick a git tag from https://github.com/ruby/ruby/releases

Install it like so: rvm install ruby-v1_9_or_whatever --verify-downloads 1

rvm method 2:

download the .tar.bz2 from a mirror such as http://mirrorservice.org/sites/ftp.ruby-lang.org/pub/ruby/

put it in $rvm_path/archives/

install it like so: rvm install ruby-1.9.999-whatever --disable-binary