I have just discovered that old git URLs, mentioned in various web pages
and manuals do not work. For example,
git clone git://common-lisp.net/projects/asdf/asdf.git
fails with
fatal: unable to connect to common-lisp.net:
common-lisp.net[0: 148.251.248.130]: errno=Connection refused
common-lisp.net[1: 2a01:4f8:200:4310::30]: errno=Network is unreachable
New format, as suggested at GitLab project pages:
git clone git@common-lisp.net:asdf/asdf.git
works.
It makes sense, if technically possible, to support old addresses too.