我在Windows 10上有多个Bitbucket账户（对应不同的工作组织），最近尝试用SSH克隆其中一个仓库时遇到了问题，想请大家帮忙排查下。

我已经按照Bitbucket的SSH密钥配置指南完成了设置，并且执行ssh -T git@bitbucket.org时能成功认证，输出如下：

authenticated via ssh key.
You can use git to connect to Bitbucket. Shell access is disabled

但当我执行克隆命令时：

git clone git@bitbucket.org:MyName/MyRepo.git

却收到权限拒绝的错误：

Cloning into 'MyRepo'...
git@bitbucket.org: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

我怀疑是多账户的问题导致Bitbucket使用了错误的SSH密钥来克隆仓库，想请教怎么强制它使用我指定的密钥，或者让它在我的设备上找到正确的那个？

我已经尝试的排查步骤： #

• 加-v参数重新执行克隆命令，没有得到更多有效信息：

  git clone -v git@bitbucket.org:MyName/MyRepo.git
  

  输出依然是：

  Cloning into 'MyRepo'...
  git@bitbucket.org: Permission denied (publickey).
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights
  and the repository exists.
  

• 执行ssh -T -v git@bitbucket.org查看详细认证日志，发现日志里尝试的密钥中，没有我专门为这个Bitbucket账户创建的自定义名称密钥。而且我的C:\Users\MyName/.ssh文件夹里只有两个文件：known_hosts和我准备使用的目标密钥，没有其他密钥文件。完整日志如下：

  OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
  debug1: Connecting to bitbucket.org [2406:da00:ff00::22c5:2ef4] port 22.
  debug1: Connection established.
  debug1: identity file C:\\Users\\MyName/.ssh/id_rsa type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_rsa-cert type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_dsa type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_dsa-cert type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_ecdsa type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_ecdsa-cert type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_ed25519 type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_ed25519-cert type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_xmss type -1
  debug1: identity file C:\\Users\\MyName/.ssh/id_xmss-cert type -1
  debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
  debug1: Remote protocol version 2.0, remote software version conker_eda5298d7e 60ddf9423977
  debug1: no match: conker_eda5298d7e 60ddf9423977
  debug1: Authenticating to bitbucket.org:22 as 'git'
  debug1: SSH2_MSG_KEXINIT sent
  debug1: SSH2_MSG_KEXINIT received
  debug1: kex: algorithm: curve25519-sha256@libssh.org
  debug1: kex: host key algorithm: rsa-sha2-512
  debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
  debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
  debug1: Server host key: ssh-rsa SHA256:zzXQOXSRBEiUtuE8AikJYKwbHaxvSc0ojez9YXaXXXXX
  debug1: Host 'bitbucket.org' is known and matches the RSA host key.
  debug1: Found key in C:\\Users\\MyName/.ssh/known_hosts:7
  debug1: rekey out after 134217728 blocks
  debug1: SSH2_MSG_NEWKEYS sent
  debug1: expecting SSH2_MSG_NEWKEYS
  debug1: SSH2_MSG_NEWKEYS received
  debug1: rekey in after 134217728 blocks
  debug1: Will attempt key: MyName@DESKTOP-KQ34PDP RSA SHA256:ypYnv30FvYLDVY1c2p7PngPPjy4uPR8pn4yXXXXXX agent
  debug1: Will attempt key: C:\\Users\\MyName/.ssh/id_rsa
  debug1: Will attempt key: C:\\Users\\MyName/.ssh/id_dsa
  debug1: Will attempt key: C:\\Users\\MyName/.ssh/id_ecdsa
  debug1: Will attempt key: C:\\Users\\MyName/.ssh/id_ed25519
  debug1: Will attempt key: C:\\Users\\MyName/.ssh/id_xmss
  debug1: SSH2_MSG_EXT_INFO received
  debug1: kex_input_ext_info: server-sig-algs=<ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ssh-rsa,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-512,ssh-dss>
  debug1: SSH2_MSG_SERVICE_ACCEPT received
  debug1: Authentications that can continue: publickey
  debug1: Next authentication method: publickey
  debug1: Offering public key: MyName@DESKTOP-KQ34PDP RSA SHA256:ypYnv30FvYLDVY1c2p7PngPPjy4uPR8pn4yXXXXXXX agent
  debug1: Server accepts key: MyName@DESKTOP-KQ34PDP RSA SHA256:ypYnv30FvYLDVY1c2p7PngPPjy4uPR8pn4yXXXXXX agent
  debug1: Authentication succeeded (publickey).
  Authenticated to bitbucket.org ([2406:da00:ff00::22c5:2ef4]:22).
  debug1: channel 0: new [client-session]
  debug1: Entering interactive session.
  debug1: pledge: network
  debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
  authenticated via ssh key.
  You can use git to connect to Bitbucket. Shell access is disabled
  debug1: channel 0: free: client-session, nchannels 1
  Transferred: sent 3016, received 2276 bytes, in 0.2 seconds
  12841.5
  debug1: Exit status 0
  received
  

额外的疑惑： #

我还发现一个奇怪的现象：在PowerShell里执行ssh -T git@bitbucket.org能成功认证，但在Git Bash里执行同样的命令却报错：

git@bitbucket.org: Permission denied (publickey).

想请教这两个环境之间有什么差异导致了这个情况？

备注：内容来源于stack exchange，提问作者mans