The GNU/Hurd boxes are only available for people who have already shown some level of involvement in the project. If you simply want to try the Hurd, the easiest way is running it in a virtual machine.

An alternative to online shell access may be using a QEMU image.

[[!table Error: Can't locate Text/CSV.pm in @INC (you may need to install the Text::CSV module) (@INC entries checked: /home/hurdmirror/web/.library /etc/perl /usr/local/lib/x8664-linux-gnu/perl/5.40.1 /usr/local/share/perl/5.40.1 /usr/lib/x8664-linux-gnu/perl5/5.40 /usr/share/perl5 /usr/lib/x8664-linux-gnu/perl-base /usr/lib/x8664-linux-gnu/perl/5.40 /usr/share/perl/5.40 /usr/local/lib/site_perl) at (eval 1453) line 1. BEGIN failed--compilation aborted at (eval 1453) line 1. ]]

If you are a Debian Developer, you can log into the exodar.debian.net machine with your DD account, your public ssh keys are already there. Debian maintainers can also request an account.