어떤 사용자도 키를 사용하여 최근 업그레이드된 CentOS 7 시스템에 SSH를 통해 접속할 수 없습니다.

방금 CentOS 7로 업그레이드한 두 대의 서버가 있는데 그 이후로 어떤 사용자도 SSH 액세스에 키를 사용할 수 없으므로 항상 비밀번호가 필요합니다.
이는 다른 서버에서는 발생하지 않으며 동일한 시스템에서 CentOS 6을 사용하는 경우에도 발생하지 않습니다. .ssh 디렉터리와 가장 일반적인 인증 폴더에 대한 권한을 확인한 후 문제를 Google에서 검색했을 때 .ssh에 있는 모든 파일이 올바른 사용자가 소유하고 있음을 발견했습니다.

Google이나 StackExchange의 다른 답변은 모두 오타나 권한 문제로 귀결되므로 도움이 되지 않았습니다. 출력은 이 질문에 제공된 것과 매우 유사/동일해 보입니다(이 사용자에 대한 SSH 키 인증이 실패하는 이유는 무엇입니까? (센토스 7)), 그러나 ssh-copy-id를 사용할 때 권한 오류가 발생하지 않기 때문에 그들에게 효과가 있었던 솔루션이 우리에게는 효과가 없습니다.

누구 아이디어나 제안이 있나요?

편집: 추가 관련 정보:

• 업데이트된 서버는 OpenSSH_7.4를 실행하고 있고 사람들이 SSH를 시도하는 다른 서버는 OpenSSH_5.3을 실행하고 있습니다.
• 이것은 ssh -vvv 출력입니다(편집됨). OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to {servername} [159.28.23.7] port 22. debug1: Connection established. debug1: identity file /{home directory}/{username}/.ssh/identity type -1 debug1: identity file /{home directory}/{username}/.ssh/identity-cert type -1 debug3: Not a RSA1 key file /{home directory}/{username}/.ssh/id_rsa. debug2: key_type_from_name: unknown key type '-----BEGIN' debug3: key_read: missing keytype debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug3: key_read: missing whitespace debug2: key_type_from_name: unknown key type '-----END' debug3: key_read: missing keytype debug1: identity file /{home directory}/{username}/.ssh/id_rsa type 1 debug1: identity file /{home directory}/{username}/.ssh/id_rsa-cert type -1 debug1: identity file /{home directory}/{username}/.ssh/id_dsa type -1 debug1: identity file /{home directory}/{username}/.ssh/id_dsa-cert type -1 debug1: identity file /{home directory}/{username}/.ssh/id_ecdsa type -1 debug1: identity file /{home directory}/{username}/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4 debug1: match: OpenSSH_7.4 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.3 debug2: fd 3 setting O_NONBLOCK debug1: SSH2_MSG_KEXINIT sent debug3: Wrote 864 bytes for a total of 885 debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,[email protected] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,[email protected] debug2: kex_parse_kexinit: hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96 debug2: kex_parse_kexinit: hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96 debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: 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,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519 debug2: kex_parse_kexinit: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc debug2: kex_parse_kexinit: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-sha1 debug1: kex: server->client aes128-ctr hmac-sha1 none debug2: mac_setup: found hmac-sha1 debug1: kex: client->server aes128-ctr hmac-sha1 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<2048<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug3: Wrote 24 bytes for a total of 909 debug2: dh_gen_key: priv key bits set: 152/320 debug2: bits set: 1019/2048 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug3: Wrote 272 bytes for a total of 1181 debug3: check_host_in_hostfile: host {servername} filename /{home directory}/{username}/.ssh/known_hosts debug3: check_host_in_hostfile: host {servername} filename /{home directory}/{username}/.ssh/known_hosts debug3: check_host_in_hostfile: match line 1 debug3: check_host_in_hostfile: host 159.28.23.7 filename /{home directory}/{username}/.ssh/known_hosts debug3: check_host_in_hostfile: host 159.28.23.7 filename /{home directory}/{username}/.ssh/known_hosts debug3: check_host_in_hostfile: match line 1 debug1: Host '{servername}' is known and matches the RSA host key. debug1: Found key in /{home directory}/{username}/.ssh/known_hosts:1 debug2: bits set: 1035/2048 debug1: ssh_rsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: Wrote 16 bytes for a total of 1197 debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug3: Wrote 52 bytes for a total of 1249 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /{home directory}/{username}/.ssh/identity ((nil)) debug2: key: /{home directory}/{username}/.ssh/id_rsa (0x7f769e632270) debug2: key: /{home directory}/{username}/.ssh/id_dsa ((nil)) debug2: key: /{home directory}/{username}/.ssh/id_ecdsa ((nil)) debug3: Wrote 84 bytes for a total of 1333 debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred gssapi-keyex,gssapi-with-mic,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: /{home directory}/{username}/.ssh/identity debug3: no such identity: /{home directory}/{username}/.ssh/identity debug1: Offering public key: /{home directory}/{username}/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug3: Wrote 628 bytes for a total of 1961 debug1: Authentications that can continue: publickey,password debug1: Trying private key: /{home directory}/{username}/.ssh/id_dsa debug3: no such identity: /{home directory}/{username}/.ssh/id_dsa debug1: Trying private key: /{home directory}/{username}/.ssh/id_ecdsa debug3: no such identity: /{home directory}/{username}/.ssh/id_ecdsa 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

편집 2: 이는 로컬 사용자에게는 발생하지 않고 모든 서버 간에 공유되는 위치에 사용자 디렉토리가 있는 사용자에게만 발생하는 것 같습니다.