i had the same problem, it started after i rebuilded apache and php again.....
the solution:
it is taken from mysql website -
http://dev.mysql.com/doc/mysql/en/old-client.html
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:
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.
Note: In PHP, the mysql extension does not support the new authentication protocol in MySQL 4.1.1 and higher. This is true regardless of the PHP version being used. If you wish to use the mysql extension with MySQL 4.1 or newer, you will need to follow one of the options discussed above for configuring MySQL to work with old clients. The mysqli extension (stands for "MySQL, Improved"; new in PHP 5) is compatible with the improved password hashing employed in MySQL 4.1 and higher, and no special configuration of MySQL need be done in order to use this newer MySQL client library for PHP. For more information about the mysqli extension, see
http://php.net/mysqli.
For additional background on password hashing and authentication, see Section 5.6.9, “Password Hashing in MySQL 4.1”.
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User Comments
Posted by Dan Beatty on February 2 2005 3:28pm [Delete] [Edit]
After hours of searching, it appears (in spite of all of the information that suggests this is an upgrade
issue) that it really is a PHP support issue. I'm using PHP 4.3.9, so maybe PHP 5.0 has addressed
this, but I haven't had time to wade into that.
So I settled for using the old 16-byte password encryption.
In my.ini file in the mySQL directory (e.g., C:\Program Files\MySQL\my.ini), add the following :
#Use old password encryption method
old_passwords
Save and close the file. Where you add these lines really doesn?t seem to matter, but most of what
I read said to put them in the [mysqld] section.
If you use phpAdmin there are further issues. See mglatts's post on 7 Jan 2005 for discussion of those at
http://forums.mysql.com/read.php?11,640 ... #msg-10611 <
http://forums.mysql.com/read.php?11,6400,10611>.
Posted by Bob Stein on March 8 2005 9:57pm [Delete] [Edit]
I had this error from PHP mysql_connect(host, user, password). I thought it was a red herring for a long time because a gibberish password would give it too. But no, it really appears to be an issue with higher security passwords. Further confusing the issue, different users can have different potency passwords. What works via mysql command-line might not work via PHP. Find out which flavor of password you've got with:
SHOW GRANTS;
You'll see 32 hexadecimal digits in the scrambled password on a user that's victimized by the error message. You can reduce this to 16 digits -- and make the error go away -- by reassigning a low-tech password to the user account, using the instructions above (the OLD_PASSWORD() function). As Dan says, PHP 4 appears to be compatible only with the older password scheme.
Posted by [name withheld] on March 29 2005 6:51pm [Delete] [Edit]
Also, if you've already set the password, watch carefully, because it will match but not update the user record if you're trying to set it using these commands to the same password. you have to first change it to a temporary password, then use the old_password command to set your password in.
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