sshtunnel.BaseSSHTunnelForwarderError: Could not establish session to SSH gateway



with SSHTunnelForwarder(
        ('10.42.100.4', 22),
        ssh_username='serv_user',
        ssh_password='serv_pass',
        remote_bind_address=('127.0.0.1', 8080)
    ):
        logger.debug('ssh tunnel estabilished')
        client = paramiko.SSHClient()
        client.load_system_host_keys()
        client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        client.connect('127.0.0.1', 22)
        client.close()