環境

Java代碼

 public static void main(String[] args) {
        Jedis jedis = new Jedis("**.**.**.**",6379);
        System.out.println(jedis.ping());
    }

Maven

<dependencies>
    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>2.9.0</version>
    </dependency>
  </dependencies>

服務器使用的是阿里云Ecs

問題

jedis訪問Ecs的Redis報錯

Exception in thread "main" redis.clients.jedis.exceptions.JedisConnectionException: java.net.ConnectException: Connection refused: connect
    at redis.clients.jedis.Connection.connect(Connection.java:207)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
    at redis.clients.jedis.Connection.sendCommand(Connection.java:126)
    at redis.clients.jedis.Connection.sendCommand(Connection.java:121)
    at redis.clients.jedis.BinaryClient.ping(BinaryClient.java:106)
    at redis.clients.jedis.BinaryJedis.ping(BinaryJedis.java:195)
    at com.test.redis.JedisTest.main(JedisTest.java:12)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at redis.clients.jedis.Connection.connect(Connection.java:184)
    ... 11 more

原因分析

1. Ecs的防火強攔截了請求

   • 在Ecs終端執行以下命令
   Paste_Image.png

   Active：inactive這表明防火墻沒有開啟

2. Redis配置文件有問題（默認只能是本地訪問）
   修改redis.conf文件
   將protected-mode改為no( 保護機制默認是開啟的，如果非本地訪問，需要認證)

Paste_Image.png

同時將

bind 127.0.0.1注釋掉

Paste_Image.png

保存重啟redis
這時訪問正常了

注意

如果以上修改還有錯誤

DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, 
    no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. 
    If you want to connect from external computers to Redis you may adopt one of the following solutions: 
    1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 
    2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server. 
    3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 
    4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside.

這個問題說的很清楚了，就是你還是沒有將protected-mode設置為no導致的，