Anonymous CVS access to cvs.ruby-lang.org

I am having problems connecting to cvs.ruby-lang.org with a complaint
that anonymous access is denied.

cvs -d :pserver:anonymous@cvs.ruby-lang.org:/src login
CVS password:
cvs login: authorization failed: server cvs.ruby-lang.org
rejected access to /src for user anonymous

I am using password “anonymous” as specified here:

http://www.ruby-lang.org/en/cvsrepo.html

-Rich