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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 account 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:
1. Start `mysqld' with the `--old-passwords' option.
2. 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
Password hashing.
Info Catalog
(mysql.info.gz) Can not connect to server
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