I cannot access the git://git.osmocom.org/rtl-sdr andgit://git.osmocom.org/gr-osmosdr repositories. What is the name of the contact who is responsible for maintaining the osmocom-sdr git respositories, and what is their email address?
I would contact either your ISP or IT departement ... works fine from here. Maybe they block git protocol.
Cheers,
Sylvain