Unity: Não é possível fazer o SSH para o IP de gerenciamento do Unity, mas o login da interface do usuário funciona

Summary: O cliente não consegue acessar o SSH no IP de gerenciamento do Unity, mas pode fazer log-in na interface do usuário sem nenhum problema. (Pode ser corrigido pelo usuário)

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Symptoms

O usuário pode fazer login no Unity pela interface do usuário, mas não consegue se conectar por SSH. O erro mostra que nenhum método de troca de chaves correspondente foi encontrado.

C:\Users\administrator>ssh <Unity mgmt IP>
Unable to negotiate with <Unity mgmt IP> port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

O Unity está executando o código 5.3 que já removeu todos os algoritmos de troca de chave sha1.

 

Cause

O cliente está usando um software chamado DBSAFER como proxy ssh para controlar o acesso ssh do client ao Unity. O client estabelece uma conexão ssh com DBSAFER em vez de Unity quando ssh para o IP de gerenciamento do Unity. O DBSAFER está executando uma versão antiga do openssh que suporta apenas alguns algoritmos de troca kex antigos que não são suportados pelo cliente.

A saída "ssh -vvv <Unity mgmt IP>" mostra que o servidor está executando o SSH aberto versão 3.0 e também indica a versão DBSAFER 2.30.205.

debug1: Local version string SSH-2.0-OpenSSH_for_Windows_9.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_3.0 DBSAFER_2.30.205
debug1: compat_banner: match: OpenSSH_3.0 DBSAFER_2.30.205 pat OpenSSH_2.*,OpenSSH_3.0*,OpenSSH_3.1* compat 0x01200002

A saída "ssh -vvv" também indica que o servidor só era compatível com os seguintes algoritmos kex antigos.

Algoritmos KEX: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,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,ext-info-c,kex-strict-c-v00@openssh.com   <<<<<< client supported key exchange algorithms
debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1  <<<<< server supported key exchange algorithms
debug2: host key algorithms: ssh-rsa,ssh-dss
debug2: ciphers ctos: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael128-cbc,rijndael192-cbc,rijndael256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: ciphers stoc: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael128-cbc,rijndael192-cbc,rijndael256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: MACs ctos: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: MACs stoc: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,zlib
debug2: compression stoc: none,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: (no match)
Unable to negotiate with 10.14.161.84 port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

 

Resolution

  • Desative o DBSAFER ou configure o DBSAFER para permitir que o client ssh diretamente para o Unity.
  • Faça upgrade do DBSAFER para que ele suporte algoritmos SSH mais seguros.

 

Affected Products

Dell EMC Unity
Article Properties
Article Number: 000306077
Article Type: Solution
Last Modified: 22 Apr 2025
Version:  2
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