====== SSH não conecta em servidores Linux ======
Estou tentando a partir de um roteador cisco fazer uma conexão SSH em um servidor Linux e recebo a seguinte mensagem:
hercules#ssh -l alguem 192.168.1.8
[Connection to 192.168.1.8 aborted: error status 0]
hercules#
Visualizando os logs do roteador
hercules#sh loggi
Syslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)
No Active Message Discriminator.
No Inactive Message Discriminator.
Console logging: level debugging, 15365 messages logged, xml disabled,
filtering disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level warnings, 15320 messages logged, xml disabled,
filtering disabled
Exception Logging: size (4096 bytes)
Count and timestamp logging messages: disabled
Persistent logging: disabled
No active filter modules.
Trap logging: level informational, 15368 message lines logged
Log Buffer (51200 bytes):
015365: *Jul 31 22:23:27.573: %SSH-3-NO_MATCH: No matching cipher found: client aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc server chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
hercules#
Foi gerado um erro de não encontrar a cifra de criptografia no servidor Linux. Então vamos adicionar a cifra dentro do arquivo **/etc/ssh/sshd_config**
Ciphers +aes256-ctr,aes192-ctr,aes128-ctr,rijndael-cbc@lysator.liu.se,aes256-cbc,aes192-cbc,aes128-cbc,arcfour256,arcfour128,arcfour,cast128-cbc,blowfish-cbc,3des-cbc
e depois reiniciar o servidor ssh
root@megatron:~# /etc/init.d/ssh restart
[ ok ] Restarting ssh (via systemctl): ssh.service.
root@megatron:~#
Tentar o acesso novamente.
hercules#ssh -l alguem 192.168.1.8
Password:
Welcome to Ubuntu 16.04.1 LTS (GNU/Linux 4.4.0-130-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
Last login: Tue Jul 31 18:01:26 2018 from 192.168.1.95
alguem@megatron:~$