1.问题

内网服务器自动重启导致Redis启动保护模式（保护模式只能本地连接服务器，外网访问不了）。然后连接内网Redis服务器出现报错

Redis error: 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.
Redis command was: SELECT 0

2.解决方法

2.1.修改Redis.conf（eg：/etc/redis.conf）找到bind 127.0.0.1 配置并注释掉

# bind 127.0.0.1 

2.2.设置保护模式为no

protected-mode no

2.3.重启Redis服务器（重要：如果配置好了还是一样报错，很可能时Redis没有读取正确的配置文件。 重启时需要带上redis.conf ）

$ redis-server redis.conf