麦克:如果不改变一些东西，SSH就不能工作了。
在网上搜索了一天，没有一个好的解决方案，我在这里告诉你我的问题。
三天前，我设置了一个SSH密钥，将git用于SSH。一切都很好，我能够把所有事情推到GitHub上。从昨天起我就不能再做了。我总是得到相同的错误(如下所示)。SSH-key是SSH代理的一部分，配置文件没有被更改，甚至不可能通过SSH连接到GitHub。在其他项目和其他回复中也进行了尝试，得到了同样的错误。在过去的几天里，我没有更新塞拉或者别的什么，所以这也不可能是原因。
终端输入和输出：
User-MBP:data-analysis user$ git push -v origin master
Pushing to git@github.com:Username/data-analysis.git
ssh_exchange_identification: Connection closed by remote host
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.正常SSH-连接：
User-MBP:data-analysis user$ ssh -v git@github.com
OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /Users/user/.ssh/config
debug1: /Users/user/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to github.com [192.30.253.113] port 443.
debug1: Connection established.
debug1: identity file /Users/user/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/user/.ssh/id_rsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
ssh_exchange_identification: Connection closed by remote host谢谢你的帮助!
更新
将端口更改为22以获得以下内容：
User-MBP:data-analysis user$ git push origin master
ssh: connect to host github.com port 22: Connection refused
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.和
User-MBP:data-analysis user$ ssh -v git@github.com
OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /Users/user/.ssh/config
debug1: /Users/user/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to github.com [192.30.253.113] port 22.
debug1: connect to address 192.30.253.113 port 22: Connection refused
debug1: Connecting to github.com [192.30.253.112] port 22.
debug1: connect to address 192.30.253.112 port 22: Connection refused
ssh: connect to host github.com port 22: Connection refused回答 2
Stack Overflow用户
发布于 2017-11-14 10:39:07
对于所有寻找解决方案的人:我做了以下几次，然后成功了：
User-MacBook-Pro:~ user$ ssh git@github.com
The authenticity of host 'github.com (192.30.253.112)' can't be established.
RSA key fingerprint is <fingerprint>.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,192.30.253.112' (RSA) to the list of known hosts.
PTY allocation request failed on channel 0
Hi <username>! You've successfully authenticated, but GitHub does not provide shell access.
Connection to github.com closed.现在，git和ssh又开始工作了。不知道为什么这个解决方案以前不起作用。
不管怎样，谢谢你的回复。
Stack Overflow用户
发布于 2017-11-12 15:00:14
debug1: Connecting to github.com [192.30.253.113] port 443.
...
ssh_exchange_identification: Connection closed by remote host"ssh_exchange_identification:由远程主机关闭的连接“是指远程服务器在接收该连接后立即故意关闭它。尚未发生密钥交换或身份验证尝试。
您正在连接到端口443 (HTTPS)，而不是端口22 (SSH)。当我尝试这个错误时，我会得到同样的错误：
$ ssh -p 443 git@github.com
ssh_exchange_identification: Connection closed by remote host
$ ssh git@github.com
Permission denied (publickey).连接到端口443会产生与您所得到的相同的错误。连接到适当的ssh端口至少会尝试身份验证(因为我没有在github上设置它)，所以失败了。
显然，github不接受端口443上的ssh连接。改为连接到端口22。
编辑：
ssh: connect to host github.com port 22: Connection refused“连接拒绝”意味着您没有建立到远程服务器的TCP连接。在这种情况下，我的猜测是，这是由于您的本地网络内的防火墙，阻塞了传出的SSH连接。这可能就是为什么您首先要为SSH使用端口443。
正如@phd所指出的，github支持ssh到端口443，但您必须安排连接到"ssh.github.com“，而不是只连接"github.com”。请参阅github文件。
或者，您可以与本地网络管理员讨论允许ssh访问github的问题。
https://stackoverflow.com/questions/47249917
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