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public boolean connect() throws JSchException {

		try {
			
			session = ssh.getSession(this.usuario, this.host, this.porta);			
			session.setPassword(this.senha);
			session.setConfig("StrictHostKeyChecking", "no");
			session.connect(30000);
			setSession(session);
			setReady(true);
			
			return true;
		} catch (Exception e) {
			setReady(false);
		}		
		return false;
	}
  
  public void close() {

		if (channel != null)
			channel.disconnect();

		if (session != null)
			session.disconnect();
		
		setReady(false);
	}