Eu tenho uma instalação do CentOS 6.8 no VMware, no entanto, o processo de login do ssh é muito lento.
Eu tentei usar a opção -v para diagnosticar o problema e descobri que ele parou na última linha por alguns segundos.
OpenSSH_7.5p1, OpenSSL 1.0.2k 26 Jan 2017
debug1: Connecting to 192.168.17.128 [192.168.17.128] port 22.
debug1: Connection established.
debug1: identity file /home/theos/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/theos/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000
debug1: Authenticating to 192.168.17.128:22 as 'drizzlex'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group-exchange-sha256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: [email protected] compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: [email protected] compression: none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<3072<8192) sent
debug1: got SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: got SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: ssh-rsa SHA256:9FbIfP7k2QdKsR7iWic5+WehvIeI2C/v8UCNwQws9bs
debug1: Host '192.168.17.128' is known and matches the RSA host key.
debug1: Found key in /home/theos/.ssh/known_hosts:2
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
Então continuou
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/theos/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.17.128 ([192.168.17.128]:22).
debug1: channel 0: new [client-session]
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug1: pledge: network
Last login: Sun Apr 16 11:02:29 2017 from 192.168.17.1
Como posso resolver este problema?
Os logins lentos do SSH são geralmente devidos ao UseDNS sendo ativado em /etc/ssh/sshd_config (no lado do servidor). Observe que essa opção foi ativada por padrão até OpenSSH 6.8 .
Tente definir UseDNS no . Certifique-se de reiniciar sshd para que a configuração tenha efeito. Você também pode kill -HUP <sshd_pid> recarregar a configuração.