Jedis 连不接云虚拟机的Redis可能的各种情况

redis.clients.jedis.exceptions.JedisConnectionException: Failed connecting to ***.***.***.***:6379
    at redis.clients.jedis.Connection.connect(Connection.java:165)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:109)
    at redis.clients.jedis.Connection.sendCommand(Connection.java:114)
    at redis.clients.jedis.BinaryClient.set(BinaryClient.java:133)
    at redis.clients.jedis.Client.set(Client.java:58)
    at redis.clients.jedis.Jedis.set(Jedis.java:153)
    at redis.clients.jedis.ShardedJedis.set(ShardedJedis.java:41)
    at com.lh.JedisPoolDemo.main(JedisPoolDemo.java:40)
Caused by: java.net.SocketTimeoutException: connect timed out

# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all the network interfaces available on the server.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1
# bind 127.0.0.1 ::1

bind 127.0.0.1
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only into
# the IPv4 loopback interface address (this means Redis will be able to
# accept connections only from clients running into the same computer it
# is running).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.

//host 为云虚拟机对外的ip ,也就是xshell 登录的ip.   
Jedis jedis = new Jedis("47.98.151.13",6379); 

   jedis.auth("123456");

  System.out.println(jedis.ping());