我正在使用 fabfile 进行 django 部署。我正在通过 bastin 主机连接到我的部署服务器（使用 fabfile 中的 env.gateway 选项，env.gateway=bastin_IP），然后运行所需的命令。
Following options are set in fabfile, added for reference.
env.gateway = 'user@xx.xx.xx.1' #bastin_IP
env.key_filename = ['path/to/pem/file']
env.user = 'user'
env.port = 22
现在每当我运行命令时，它总是提示输入用户密码，消息显示如下。 [xx.xx.xx.002] 'user' 的登录密码：
注意：这里显示在消息之前的 IP 是我的部署/生产服务器的 IP。
我假设（在看到上面的消息后）是与 bastin 成功建立连接，但它没有与部署/生产服务器连接。尽管每当我尝试通过 putty（在 Windows 上）连接时，我都可以登录到 bastin 主机（使用 openssh 私钥），然后从 bastin 登录到任何其他部署/生产服务器，而无需密码。
请告诉我，实际问题是什么以及如何解决。我做错了什么？
更新： 我添加了以下代码来检查 paramiko 的调试信息：
import paramiko, os
paramiko.common.logging.basicConfig(level=paramiko.common.DEBUG)
调试日志在这里，它可能有助于更好地理解，出了什么问题：
DEBUG:paramiko.transport:starting thread (client mode): 0x8945a208
DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_2.7.2
DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-OpenSSH_7.4
INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_7.4)
DEBUG:paramiko.transport:kex algos:['curve25519-sha256', 'curve25519-sha256@libssh.org', 'ecdh-sha2-nistp256', 'ecdh-sha2-nistp384', 'ecdh-sha2-nistp521', 'diffie-hellman-group-exchang
e-sha256', 'diffie-hellman-group16-sha512', 'diffie-hellman-group18-sha512', 'diffie-hellman-group-exchange-sha1', 'diffie-hellman-group14-sha256', 'diffie-hellman-group14-sha1', 'diff
ie-hellman-group1-sha1'] server key:['ssh-rsa', 'rsa-sha2-512', 'rsa-sha2-256', 'ecdsa-sha2-nistp256', 'ssh-ed25519'] client encrypt:['chacha20-poly1305@openssh.com', 'aes128-ctr', 'ae
s192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc', 'blowfish-cbc', 'cast128-cbc', '3des-cbc'] server encrypt:['chach
a20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc', 'blowfish-cbc', 'cast
128-cbc', '3des-cbc'] client mac:['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com',
'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'] server mac:['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@open
ssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'] client compress:['
none', 'zlib@openssh.com'] server compress:['none', 'zlib@openssh.com'] client lang:[''] server lang:[''] kex follows?False
DEBUG:paramiko.transport:Kex agreed: XXXX
DEBUG:paramiko.transport:HostKey agreed: XXXX
DEBUG:paramiko.transport:Cipher agreed: XXXX
DEBUG:paramiko.transport:MAC agreed: XXXX
DEBUG:paramiko.transport:Compression agreed: none
DEBUG:paramiko.transport:kex engine KexCurve25519 specified hash_algo <built-in function openssl_sha256>
DEBUG:paramiko.transport:Switch to new keys ...
DEBUG:paramiko.transport:Trying discovered key b'6303...XXXX..5f' in E://key.pem
DEBUG:paramiko.transport:userauth is OK
INFO:paramiko.transport:Authentication (publickey) successful!
DEBUG:paramiko.transport:[chan 0] Max packet in: 32768 bytes
DEBUG:paramiko.transport:Received global request "hostkeys-00@openssh.com"
DEBUG:paramiko.transport:Rejecting "hostkeys-00@openssh.com" global request from server.
DEBUG:paramiko.transport:[chan 0] Max packet out: 32768 bytes
DEBUG:paramiko.transport:Secsh channel 0 opened.
DEBUG:paramiko.transport:starting thread (client mode): 0x8943d780
DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_2.7.2
DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-OpenSSH_7.4
INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_7.4)
DEBUG:paramiko.transport:kex algos: XXXXXXXXXXXXXXXXXXXX client lang:[''] server lang:[''] kex follows?False
DEBUG:paramiko.transport:Kex agreed: XXXX
DEBUG:paramiko.transport:HostKey agreed: XXXX
DEBUG:paramiko.transport:Cipher agreed: XXXX
DEBUG:paramiko.transport:MAC agreed: XXXX
DEBUG:paramiko.transport:Compression agreed: none
DEBUG:paramiko.transport:kex engine KexCurve25519 specified hash_algo <built-in function openssl_sha256>
DEBUG:paramiko.transport:Switch to new keys ...
DEBUG:paramiko.transport:Adding ssh-ed25519 host key for XX.XX.XX.X: b'7bdd....XXXX....026c2e'
DEBUG:paramiko.transport:Trying discovered key b'6303....XXXX....39bf5f' in E://key.pem
DEBUG:paramiko.transport:userauth is OK
INFO:paramiko.transport:Authentication (publickey) failed.
[XX.XX.XX.X] Login password for 'user':