When Redis is installed, it is not password protected by default, and password protected for security purposes.

 Log in locally on the client side 192.168.56.56 The server
[root@shanxi src]# ./redis-cli

 View password. The current password is empty
127.0.0.1:6379> config get requirepass
1) "requirepass"
2) ""

 Set the password to  aabbcc
127.0.0.1:6379> config set requirepass "aabbcc"
OK

 Check the password again, it shows insufficient permissions, need to log in again
127.0.0.1:6379> config get requirepass
(error) NOAUTH Authentication required.

127.0.0.1:6379> exit

 Log back in
[root@shanxi src]# ./redis-cli

 Verify password is  aabbcc
127.0.0.1:6379> auth "aabbcc"
OK

 Check the password again   Is shown as  aabbcc  Yes, it worked
127.0.0.1:6379> config get requirepass
1) "requirepass"
2) "aabbcc"