Raspberry Pi는 SSH 로그인 후 즉시 연결을 닫습니다.

Raspberry Pi는 SSH 로그인 후 즉시 연결을 닫습니다.

SSH를 활성화하고 파이에서 작업 중입니다(여러 번 사용했습니다).

오늘부터 비밀번호를 입력하자마자 연결이 종료되기 시작합니다.

다음을 통해 ID 카드를 받으려고 합니다.

ssh [email protected] id

그러나 아무것도 돌아오지 않았습니다.

이것은 -vvv 로그입니다:

OpenSSH_7.6p1, LibreSSL 2.6.2
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to XXX.XXX.XXX.XXX port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gio/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Raspbian-10+deb9u1
debug1: match: OpenSSH_7.4p1 Raspbian-10+deb9u1 pat OpenSSH* compat 0x04000000
debug3: fd 5 is O_NONBLOCK
debug1: Authenticating to XXX.XXX.XXX.XXX:22 as 'pi'
debug3: hostkeys_foreach: reading file "/Users/gio/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/gio/.ssh/known_hosts:23
debug3: load_hostkeys: loaded 1 keys from XXX.XXX.XXX.XXX
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-group-exchange-sha1,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],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: ssh-rsa,rsa-sha2-512,rsa-sha2-256,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:DnP87WARo4OBChrMsVUrmJSOtXfTex+1QWp8poAKmYE
debug3: hostkeys_foreach: reading file "/Users/gio/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/gio/.ssh/known_hosts:23
debug3: load_hostkeys: loaded 1 keys from XXX.XXX.XXX.XXX
debug1: Host 'XXX.XXX.XXX.XXX' is known and matches the ECDSA host key.
debug1: Found key in /Users/gio/.ssh/known_hosts:23
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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 after 134217728 blocks
debug2: key: /Users/gio/.ssh/id_rsa (0x0)
debug2: key: /Users/gio/.ssh/id_dsa (0x0)
debug2: key: /Users/gio/.ssh/id_ecdsa (0x0)
debug2: key: /Users/gio/.ssh/id_ed25519 (0x0)
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,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: Trying private key: /Users/gio/.ssh/id_rsa
debug3: no such identity: /Users/gio/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /Users/gio/.ssh/id_dsa
debug3: no such identity: /Users/gio/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /Users/gio/.ssh/id_ecdsa
debug3: no such identity: /Users/gio/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /Users/gio/.ssh/id_ed25519
debug3: no such identity: /Users/gio/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password: 
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
Connection closed by XXX.XXX.XXX.XXX port 22

답변1

문제의 원인은 저전압으로 밝혀졌습니다. 전원 공급 장치를 교체하고 파이를 다시 시작하면 문제가 해결되었습니다.

답변2

로그인을 허용하는 SSH 서버 장치입니다.

사용자의 로그인이 허용되지 않으면 서버는 자세한 이유를 반환하지 않고 단순히 연결을 끊습니다(해커에게 도움이 될 수 있음).

이유를 알아보려면 Raspberry Pi의 /var/log/auth를 확인하세요.

관련 정보