git hangs upon clone/pull from a specific repository

This hangs on several machines/networks, also for other maintainers:

$  git clone --branch 7.x-1.x stefan.r@git.drupal.org:project/ofed_switcher.git
Cloning into 'ofed_switcher'...
stefan.r@git.drupal.org's password: 
^C

But this works (no authentication):

$  git clone --branch 7.x-1.x http://git.drupal.org/project/ofed_switcher.git
Cloning into 'ofed_switcher'...
remote: Counting objects: 105, done.
remote: Compressing objects: 100% (99/99), done.
remote: Total 105 (delta 45), reused 0 (delta 0)
Receiving objects: 100% (105/105), 28.65 KiB | 0 bytes/s, done.
Resolving deltas: 100% (45/45), done.
Checking connectivity... done

And this works (another repository):

$ git clone stefan.r@git.drupal.org:project/ofed_theme_nerra.git
Cloning into 'ofed_theme_nerra'...
stefan.r@git.drupal.org's password: 
remote: Counting objects: 415, done.
remote: Compressing objects: 100% (369/369), done.
remote: Total 415 (delta 222), reused 115 (delta 37)
Receiving objects: 100% (415/415), 339.33 KiB | 300.00 KiB/s, done.
Resolving deltas: 100% (222/222), done.
Checking connectivity... done

So the problem seems to be attempting to connect as a maintainer to that specific repository. Having this issue as of a few hours ago.