早上服务员态度很好。但是吃完午饭回来，突然发现服务器无法登机了。顺便说一句，我的笔记本电脑是Macbook Air。
终端输入ssh lab报错为：
> user@.. ~ % ssh lab
kex_exchange_identification: Connection closed by remote host
Connection closed by xxx.xx.x.xxx port 22
输入 ssh -v [email protected] 再次报告错误，详细信息如下：
> user@... ~ % ssh -v [email protected]
OpenSSH_9.0p1, LibreSSL 3.3.6
debug1: Reading configuration data /Users/.../.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to xxx.xxx.xxx.xxx [xxx.xxx.xxx.xxx] port 22.
debug1: Connection established.
debug1: identity file /Users/.../.ssh/id_rsa type 0
debug1: identity file /Users/.../.ssh/id_rsa-cert type -1
debug1: identity file /Users/.../.ssh/id_ecdsa type -1
debug1: identity file /Users/.../.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/.../.ssh/id_ecdsa_sk type -1
debug1: identity file /Users/.../.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /Users/.../.ssh/id_ed25519 type -1
debug1: identity file /Users/..../ssh/id_ed25519-cert type -1
debug1: identity file /Users/.../.ssh/id_ed25519_sk type -1
debug1: identity file /Users/.../.ssh/id_ed25519_sk-cert type -1
debug1: identity file /Users/.../.ssh/id_xmss type -1
debug1: identity file /Users/.../.ssh/id_xmss-cert type -1
debug1: identity file /Users/.../.ssh/id_dsa type -1
debug1: identity file /Users/.../.ssh/id_dsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.0
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.0
debug1: compat_banner: match: OpenSSH_8.0 pat OpenSSH* compat 0x04000000
debug1: Authenticating to xxx.xxx.xxx.xx:22 as 'lab'
debug1: load_hostkeys: fopen /Users/.../.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ...
debug1: load_hostkeys: fopen /Users/.../.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'xxx.xxx.xxx.xxx' is known and matches the ED25519 host key.
debug1: Found key in /Users/zkey/.ssh/known_hosts:1
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: get_agent_identities: bound agent to hostkey
debug1: get_agent_identities: ssh_fetch_identitylist: agent contains no identities
debug1: Will attempt key: /Users/.../.ssh/id_rsa ...
debug1: Will attempt key: /Users/.../.ssh/id_ecdsa
debug1: Will attempt key: /Users/.../.ssh/id_ecdsa_sk
debug1: Will attempt key: /Users/.../.ssh/id_ed25519
debug1: Will attempt key: /Users/.../.ssh/id_ed25519_sk
debug1: Will attempt key: /Users/.../.ssh/id_xmss
debug1: Will attempt key: /Users/.../.ssh/id_dsa
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: ...
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: publickey
debug1: Offering public key: /Users/.../.ssh/id_rsa RSA ...
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Trying private key: /Users/.../.ssh/id_ecdsa
debug1: Trying private key: /Users/.../.ssh/id_ecdsa_sk
debug1: Trying private key: /Users/.../.ssh/id_ed25519
debug1: Trying private key: /Users/.../.ssh/id_ed25519_sk
debug1: Trying private key: /Users/.../.ssh/id_xmss
debug1: Trying private key: /Users/.../.ssh/id_dsa
debug1: No more authentication methods to try.
[email protected]: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
请问如何解决这个问题！谢谢！否则我就无法完成我的工作。欧兹
我也尝试在 VScode 中远程连接服务器，但是报错 Could not build connection to "lab"。
问题已经解决了。 我发现~/.ssh.config文件中有两行奇怪的行， 他们是：
Host xxx HostName xxx.xx.xxx.xxx同样的问题。使用其他客户端计算机登录到该服务器，然后运行命令：
“systemctl 重新启动 ssh”
完成。