GitHub has permanently discontinued support for several outdated cryptographic standards, specifically TLSv1, TLSv1.1, diffie-hellman-group1-sha1, and diffie-hellman-group14-sha1, affecting all HTTPS and SSH connections to both github.com and api.github.com. The removal of these weak cryptographic protocols, aimed at enhancing security, was initially announced last year, with a definitive timeline provided three weeks ago. Users encountering any issues or requiring assistance are encouraged to contact GitHub for support. The announcement was made by Patrick Toomey.