Connection Name: TEST
Connection Method: Standard TCP/IP over SSH

SSH Hostname: x.x.x.x:22
SSH Username: root
SSH Password: myRootPa$$word
SSH Key File: <NOT-USING-KEYFILE>

MySQL Hostname: 127.0.0.1
MySQL Server Port: 3306
Username: root
Password: myMySQLPa$$word

7.8

+------------------+
| version()        |
+------------------+
| 5.5.40-0+wheezy1 |
+------------------+
1 row in set (0.00 sec)

Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
UsePrivilegeSeparation yes

KeyRegenerationInterval 3600
ServerKeyBits 768
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes

IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes

AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes

8.0

+-----------------+
| version()       |
+-----------------+
| 5.5.43-0+deb8u1 |
+-----------------+
1 row in set (0.00 sec)

Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
UsePrivilegeSeparation yes

KeyRegenerationInterval 3600
ServerKeyBits 1024
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes

IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes

AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes

Could not connect the SSH Tunnel
Authentication error, unhandled exception caught in tunnel manager, please refer to logs for details

10:00:04 [INF][     SSH tunnel]: Starting tunnel
10:00:04 [INF][     SSH tunnel]: Existing SSH tunnel not found, opening new one
10:00:07 [INF][     SSH tunnel]: Opening SSH tunnel to 10.232.50.15:22
10:00:07 [WRN][sshtunnel.py:_connect_ssh:287]: IOError, probably caused by file C:UsersmyUserAppDataRoamingMySQLWorkbenchsshknown_hosts not found, the message was: [Errno 2] No such file or directory: u'C:\Users\myUser\AppData\Roaming\MySQL\Workbench\ssh\known_hosts'
10:00:07 [ERR][sshtunnel.py:notify_exception_error:233]: Traceback (most recent call last):
  File "C:Program FilesMySQLMySQL Workbench 6.3 CEsshtunnel.py", line 297, in _connect_ssh
    look_for_keys=has_key, allow_agent=has_key)
  File "C:Program FilesMySQLMySQL Workbench 6.3 CE/python/site-packagesparamikoclient.py", line 301, in connect
    t.start_client()
  File "C:Program FilesMySQLMySQL Workbench 6.3 CE/python/site-packagesparamikotransport.py", line 461, in start_client
    raise e
SSHException: Incompatible ssh peer (no acceptable kex algorithm)

10:00:07 [INF][     SSH tunnel]: TunnelManager.wait_connection authentication error: Authentication error, unhandled exception caught in tunnel manager, please refer to logs for details
10:00:07 [ERR][     SSH tunnel]: Authentication error opening SSH tunnel: Authentication error, unhandled exception caught in tunnel manager, please refer to logs for details

C:UsersmyUserAppDataRoamingMySQLWorkbench

root@debian:~# iptables -vnL

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Version 6.3.3.0 build 592 (64 bits)
Version 6.0.9.11421 build 1170 (32 bits)

KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1