错误 2049 (HY000)：使用旧的连接（4.1.1 之前的版本）

测试环境新装了MySQL服务器，在登陆时无法成功登陆。其提示为使用的旧的认证协议而被拒绝。其具体的错误提示为ERROR 2049 (HY000

测试环境新装了MySQL服务器，在登陆时无法成功登陆。其提示为使用的旧的认证协议而被拒绝。其具体的错误提示为ERROR 2049 (HY000): Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled)以下是关于这个问题的描述及其解决方案，供大家参考。

1、故障现象
[root@HKBO ~]# mysqladmin -u root password 'Mysqlxxx'
[root@HKBO ~]# mysql -uroot -p
Enter password:
ERROR 2049 (HY000): Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled)

 

2、有关secure_auth参数

Command-Line Format --secure-auth

System Variable Name

Variable Scope Global

Dynamic Variable Yes

Permitted Values (<= 5.6.4) Type boolean

Default OFF

Permitted Values (>= 5.6.5) Type boolean

Default ON

This option causes the server to block connections by clients that attempt to use accounts that have passwords stored in the old (pre-4.1) format. Use it to prevent all use of passwords employing the old format (and hence insecure communication over the network). Before MySQL 5.6.5, this option is disabled by default. As of MySQL 5.6.5, it is enabled by default; to disable it, use .

Server startup fails with an error if this option is enabled and the privilege tables are in pre-4.1 format. SeeSection B.5.2.4, “Client does not support authentication protocol”.

Theclient also has aoption, which prevents connections to a server if the server requires a password in old format for the client account.

Note

Passwords that use the pre-4.1 hashing method are less secure than passwords that use the native password hashing method and should be avoided. Pre-4.1 passwords are deprecated and support for them will be removed in a future MySQL release. Consequently, disabling secure authentication usingis also deprecated.

 

3、分析及解决

#查看当前的配置文件
[root@HKBO ~]# grep -v ^# /etc/my.cnf
[mysqld]
datadir=/opt/data
socket=/tmp/mysql.sock
user=mysql
old_passwords=1 

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#old_passwords
#This variable controls the password hashing method used by the PASSWORD() function.
#It also influences password hashing performed by CREATE USER and GRANT statements that specify a password using an IDENTIFIED BY clause.
#当值为1的使用正好使用的是Pre-4.1 (“old”) hashing mysql_old_password 旧密码方式，因此先将其禁用

[root@HKBO ~]# vi /etc/my.cnf

#如下，禁用后的old_passwords
[root@HKBO ~]# grep old_passwords /etc/my.cnf
#old_passwords=1

#重启mysql
[root@HKBO ~]# service mysqld stop
Shutting down MySQL.[  OK  ]

[root@HKBO ~]# service mysqld start
Starting MySQL..[  OK  ]

#登陆还是出现同样的提示
[root@HKBO ~]# mysql -uroot -p
Enter password:
ERROR 2049 (HY000): Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled)

#下面尝试使用--secure_auth=off登陆，提示需要改变密码到新格式
[root@HKBO ~]# mysql -uroot -p --secure_auth=off
Enter password:
ERROR 1275 (HY000): Server is running in --secure-auth mode, but 'root'@'localhost' has a password in the old format; please change the password to the new format

#下面我们增加secure-auth=off到配置文件
[root@HKBO ~]# grep secure-auth /etc/my.cnf
secure-auth=off

#再次重启mysql
[root@HKBO ~]# service mysqld stop
Shutting down MySQL.[  OK  ]
[root@HKBO ~]# service mysqld start
Starting MySQL.[  OK  ]

#此时可以透过--secure_auth=off方式登陆
[root@HKBO ~]# mysql -uroot -p --secure_auth=off
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.6.12 Source distribution

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mysql>设置 'root'@'localhost' 的密码 =password('Mysqlxxx');
查询正常，0 行受影响，1 条警告（0.01 秒）

mysql>退出
再见

#通过上述操作后仍无法登陆，仍需要使用--secure_auth=off方式才能登陆

#查看威胁的mysql客户端
[root@HKBO ~]# which mysql
/app/soft/mysql/bin/mysql

[root@HKBO ~]# /app/soft/mysql/bin/mysql -uroot -p
输入密码：
错误 2049 (HY000): 使用旧的（4.1.1 之前）身份验证进行连接协议被拒绝（启用客户端选项“secure_auth”）

[root@HKBO ~]# /app/soft/mysql/bin/mysql --version
/app/soft/mysql/bin/mysql  Ver 14.14 Distrib 5.6.12，适用于 Linux (x86_64)，使用 EditLine包装

[root@HKBO ~]# whereis mysql
mysql: /usr/bin/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

#/usr/bin下也有一个mysql客户端，其版本为5.0.95
[root@HKBO ~]# /usr/bin/mysql --version
/usr/bin/mysql  Ver 14.12 Distrib 5.0.95，适用于 RedHat-linux-gnu (x86_64)，使用 readline 5.1

#经排查，当前主机有旧版本的mysql
[root@HKBO mysql]# rpm -qa | grep -i mysql
mysql-5.0.95-3.el5

#即将卸载旧版本的mysql
[root@HKBO ~]# rpm -e --nodeps mysql-5.0.95-3.el5
警告：/etc/my.cnf 另存为/ etc/my.cnf.rpmsave