尝试从笔记本电脑和手机通过 ssh 连接到服务器。尝试连接时，两者都挂起。我已添加服务器和客户端日志，但没有看到任何有助于我了解问题所在的东西。
客户端输出：
╭─fenton@ss9 ~ ‹master*›
╰─$ ssh -vvv dell
OpenSSH_8.1p1, OpenSSL 1.1.1d 10 Sep 2019
debug1: Reading configuration data /home/fenton/.ssh/config
debug1: /home/fenton/.ssh/config line 2: Applying options for dell
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolve_canonicalize: hostname 192.168.1.20 is address
debug2: ssh_connect_direct
debug1: Connecting to dell [192.168.1.20] port 22.
debug1: Connection established.
debug1: identity file /home/fenton/.ssh/id_rsa type 0
debug1: identity file /home/fenton/.ssh/id_rsa-cert type -1
debug1: identity file /home/fenton/.ssh/id_dsa type -1
debug1: identity file /home/fenton/.ssh/id_dsa-cert type -1
debug1: identity file /home/fenton/.ssh/id_ecdsa type -1
debug1: identity file /home/fenton/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/fenton/.ssh/id_ed25519 type -1
debug1: identity file /home/fenton/.ssh/id_ed25519-cert type -1
debug1: identity file /home/fenton/.ssh/id_xmss type -1
debug1: identity file /home/fenton/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.1
debug1: match: OpenSSH_8.1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.1.20:22 as 'fenton'
debug3: hostkeys_foreach: reading file "/home/fenton/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/fenton/.ssh/known_hosts:55
debug3: load_hostkeys: loaded 1 keys from 192.168.1.20
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:MCd1xJqd/iYfOFjfp2wotdb1RrqJwxaIZrQADw0cMHk
debug3: hostkeys_foreach: reading file "/home/fenton/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/fenton/.ssh/known_hosts:55
debug3: load_hostkeys: loaded 1 keys from 192.168.1.20
debug1: Host '192.168.1.20' is known and matches the ECDSA host key.
debug1: Found key in /home/fenton/.ssh/known_hosts:55
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /home/fenton/.ssh/id_rsa RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug1: Will attempt key: /home/fenton/.ssh/id_dsa
debug1: Will attempt key: /home/fenton/.ssh/id_ecdsa
debug1: Will attempt key: /home/fenton/.ssh/id_ed25519
debug1: Will attempt key: /home/fenton/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/fenton/.ssh/id_rsa RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/fenton/.ssh/id_rsa RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug3: sign_and_send_pubkey: RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug3: sign_and_send_pubkey: signing using rsa-sha2-512
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.1.20 ([192.168.1.20]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 4
debug1: Remote: /home/fenton/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 4
debug1: Remote: /home/fenton/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x48
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
服务器输出：
╭─fenton@dell ~ ‹master*›
╰─$ sudo /usr/bin/sshd -d -D 255 ↵
debug1: sshd version OpenSSH_8.1, OpenSSL 1.1.1d 10 Sep 2019
debug1: private host key #0: ssh-rsa SHA256:5nVbVja+G//lvdDltSTweh9I/EfuwPWn8OZE9hl8HZU
debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:MCd1xJqd/iYfOFjfp2wotdb1RrqJwxaIZrQADw0cMHk
debug1: private host key #2: ssh-ed25519 SHA256:g2eFNxcBFlT/KH9QIfK5pA1KqGw9eq4ThJLjku3pn88
debug1: rexec_argv[0]='/usr/bin/sshd'
debug1: rexec_argv[1]='-d'
debug1: rexec_argv[2]='-D'
debug1: Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 192.168.1.72 port 44554 on 192.168.1.20 port 22 rdomain ""
debug1: Local version string SSH-2.0-OpenSSH_8.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.1
debug1: match: OpenSSH_8.1 pat OpenSSH* compat 0x04000000
debug1: permanently_set_uid: 65534/65534 [preauth]
debug1: list_hostkey_types: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: algorithm: curve25519-sha256 [preauth]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256 [preauth]
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: rekey out after 134217728 blocks [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: Sending SSH2_MSG_EXT_INFO [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: rekey in after 134217728 blocks [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user fenton service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
debug1: PAM: initializing for "fenton"
debug1: PAM: setting PAM_RHOST to "192.168.1.72"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: userauth-request for user fenton service ssh-connection method publickey [preauth]
debug1: attempt 1 failures 0 [preauth]
debug1: userauth_pubkey: test pkalg rsa-sha2-512 pkblob RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo [preauth]
debug1: temporarily_use_uid: 1000/1000 (e=0/0)
debug1: trying public key file /home/fenton/.ssh/authorized_keys
debug1: fd 4 clearing O_NONBLOCK
debug1: /home/fenton/.ssh/authorized_keys:1: matching key found: RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug1: /home/fenton/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
Accepted key RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo found at /home/fenton/.ssh/authorized_keys:1
debug1: restore_uid: 0/0
Postponed publickey for fenton from 192.168.1.72 port 44554 ssh2 [preauth]
debug1: userauth-request for user fenton service ssh-connection method publickey [preauth]
debug1: attempt 2 failures 0 [preauth]
debug1: temporarily_use_uid: 1000/1000 (e=0/0)
debug1: trying public key file /home/fenton/.ssh/authorized_keys
debug1: fd 4 clearing O_NONBLOCK
debug1: /home/fenton/.ssh/authorized_keys:1: matching key found: RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug1: /home/fenton/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
Accepted key RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo found at /home/fenton/.ssh/authorized_keys:1
debug1: restore_uid: 0/0
debug1: auth_activate_options: setting new authentication options
debug1: do_pam_account: called
Accepted publickey for fenton from 192.168.1.72 port 44554 ssh2: RSA SHA256:/hy19zobmQxJ1V5twvfR6E+rPqPeuP+APgtk4R1cLzo
debug1: monitor_child_preauth: fenton has been authenticated by privileged process
debug1: auth_activate_options: setting new authentication options [preauth]
debug1: monitor_read_log: child log fd closed
debug1: PAM: establishing credentials
User child is on pid 1071
debug1: PAM: establishing credentials
debug1: permanently_set_uid: 1000/1000
debug1: rekey in after 134217728 blocks
debug1: rekey out after 134217728 blocks
debug1: ssh_packet_set_postauth: called
debug1: active: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug1: Entering interactive session for SSH2.
debug1: server_init_dispatch
debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384
debug1: input_session_request
debug1: channel 0: new [server-session]
debug1: session_new: session 0
debug1: session_open: channel 0
debug1: session_open: session 0: link with channel 0
debug1: server_input_channel_open: confirm session
debug1: server_input_global_request: rtype [email protected] want_reply 0
debug1: server_input_channel_req: channel 0 request pty-req reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req pty-req
debug1: Allocating pty.
debug1: session_new: session 0
debug1: session_pty_req: session 0 alloc /dev/pts/0
debug1: server_input_channel_req: channel 0 request shell reply 1
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req shell
Starting session: shell on pts/0 for fenton from 192.168.1.72 port 44554 id 0
debug1: Setting controlling tty using TIOCSCTTY.