OpenSSH_7.3p1, OpenSSL 1.0.2j 26 Sep 2016
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolving "github.com" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to github.com [192.30.253.112] port 22.
debug1: Connection established.
debug1: identity file /home/mugbya/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/mugbya/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.3
debug1: Remote protocol version 2.0, remote software version libssh-0.7.0
debug1: no match: libssh-0.7.0
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to github.com:22 as 'git'
你缺少科學上網的配置? ssh -vvv -T git@github.com 看看。
git 沒有帳號的概念。
你這是不同的 ssh key,同一個 GitHub 帳號。
所有 GitHub 使用者都共用一個名叫 git 的 ssh 帳號。
根據 ssh 調試訊息,考慮防火牆(或類似的網路限制)的問題。檢查 Windows 防火牆設定、網路設定(你的網路是不是不允許存取 22 連接埠什麼的?有沒有透明代理?)、最後檢查中國特色的部分。
首先上圖
➜ .ssh ssh -vvv -T git@github.com
試了一下不太是ssh證書的問題,你繼續檢查吧