Mysql与MysqlODBC连接错误:Client does not support authentication protocol requested...

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本文介绍了在使用MySQL 5.0和MySQL ODBC 3.51驱动程序时遇到的‘Client does not support authentication protocol’错误。问题出现在尝试建立DSN连接时，系统提示客户端不支持服务器请求的认证协议。解决方案是通过运行SQL命令SET PASSWORD FOR 用户名@localhost = OLD_PASSWORD('密码')来更新用户密码，以兼容旧版的认证协议。

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问题描述：

mysql5.0与mysqlodbc3.51建立连接：无法建立一个访问“mysql"数据库的系统dsn。（root帐号密码都没错，”cmd”下可以正常登录）

测试数据原时有错误提示：
[MySQL][ODBC 3.51 Driver] Client does not support authentication protocol requested by server;consider upgrading MySQL client

解决办法:

SET PASSWORD FOR 用户名@localhost = OLD_PASSWORD('密码');

以下为官方说明：

写道

A.2.3 Client does not support authentication protocol
MySQL 4.1 and up uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older clients. If you upgrade the server to 4.1, attempts to connect to it with an older client may fail with the following message:

shell> mysql
Client does not support authentication protocol requested
by server; consider upgrading MySQL client
To solve this problem, you should use one of the following approaches:

Upgrade all client programs to use a 4.1.1 or newer client library.
When connecting to the server with a pre-4.1 client program, use an aclearcase/" target="_blank" >ccount that still has a pre-4.1-style password.
Reset the password to pre-4.1 style for each user that needs to use a pre-4.1 client program. This can be done using the SET PASSWORD statement and the OLD_PASSWORD() function:
mysql> SET PASSWORD FOR
-> 'some_user'@'some_host' = OLD_PASSWORD('newpwd');
Alternatively, use UPDATE and FLUSH PRIVILEGES:
mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd')
-> WHERE Host = 'some_host' AND User = 'some_user';
mysql> FLUSH PRIVILEGES;
Substitute the password you want to use for ``newpwd'' in the preceding examples. MySQL cannot tell you what the original password was, so you'll need to pick a new one.
Tell the server to use the older password hashing algorithm:
Start mysqld with the --old-passwords option.
Assign an old-format password to each account that has had its password updated to the longer 4.1 format. You can identify these accounts with the following query:
mysql> SELECT Host, User, Password FROM mysql.user
-> WHERE LENGTH(Password) > 16;
For each account record displayed by the query, use the Host and User values and assign a password using the OLD_PASSWORD() function and either SET PASSWORD or UPDATE, as described earlier.
For additional background on password hashing and authentication, see section 5.5.9 Password Hashing in MySQL 4.1.