composer failure - git clone returning 404

Hello

since yesterday we're experiencing a problem running composer.
We got the errors:
Failed to execute git clone --no-checkout 'https://git.drupal.org/project/examples' 'web/modules/contrib/examples' && cd 'web/modules/contrib/examples' && git remote add composer 'https://git.drupal.org/project/examples' && git fetch composer \n error: RPC failed; result=22, HTTP code = 404

and
Failed to execute git clone --no-checkout 'https://git.drupal.org/project/views_tree' 'web/modules/contrib/views_tree' && cd 'web/modules/contrib/views_tree' && git remote add composer 'https://git.drupal.org/project/views_tree' && git fetch composer \n error: RPC failed; result=22, HTTP code = 404

Environment
Linux Centos 7
git version 1.8.3.1

If we run git adding the ".git" extension on the repo it works, e.g.
git clone --no-checkout 'https://git.drupal.org/project/views_tree.git'

temporary solution has been to edit the .gitconfig file adding something like
[url "https://git.drupal.org/project/examples.git"]
insteadOf = https://git.drupal.org/project/examples

Maybe during the change in git repository some config have been lost?

Best regards

Francesco