Member Avatar for odee

i can't connect to mysql. the error is

Warning: mysql_connect(): Client does not support authentication protocol
requested by server; consider upgrading MySQL client in 
C:\Documents and Settings\...

im using the script here in the php tutorial:

$Host = "mysqllocation"; //location of mySQL on server
$User = "username"; //my username
$Pass = "mypass"; //my password
$Name = "db"; //name of the database to be used
$Table = "tabledb"; //name of the table within the database

mysql_connect ($Host, $User, $Pass, $Name, $Table) or die 
("unable to connect to database");
@mysql_select_db("$Name") or die ("unable to select DB");
$sqlquery = "SELECT * FROM $Table WHERE opinion = 'is horrible'";
$result = mysql_query($sqlquery);
$number = mysql_num_rows($result);
  • 2 Contributors
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  • Latest Post Latest Post by mcldev

Dani AI

Generated

The warning means the PHP MySQL client library and the MySQL server disagree on the authentication method the server expects — a very common situation when a newer server (MySQL 8+) uses the SHA-2 based plugin while an older PHP/connector does not support it. ’s call appears to be using the old ext/mysql style and is passing extra arguments; ’s suggestion to upgrade the client/connector is the most robust fix. (dev.mysql.com)

Quick checks and reproduction steps: verify the same credentials with the mysql command-line or MySQL Workbench to rule out networking/credential issues. Inspect the user entry to see which plugin the account uses:

SELECT User, Host, plugin
FROM mysql.user
WHERE User = 'your_username';

If the plugin column is caching_sha2_password (or similar), that explains the error. (dev.mysql.com)

Two practical fixes (pick one):

  • Upgrade the PHP MySQL driver / mysqlnd or switch the code to a modern API (mysqli or PDO) built against a recent client library — this preserves stronger server-side authentication.
  • If upgrading is not feasible, change the specific MySQL account to a legacy-compatible plugin as a temporary workaround (backup first):
ALTER USER 'your_username'@'host'
  IDENTIFIED WITH mysql_native_password BY 'your_password';

That command is supported by modern MySQL and will switch the account to the older client-friendly method; evaluate security implications before using it in production. (dev.mysql.com)

Additional notes: mysql_connect() takes host/user/password (not database/table); select the DB with mysql_select_db() or use mysqli/PDO which accept a database parameter and are the supported long-term choice — the ext/mysql functions are deprecated/removed in recent PHP versions. Also, create a dedicated application user (not root) and back up the server before changing authentication settings. (php.net)

Member Avatar for mcldev

IMHO, definitely upgrade MySQL if you can (depends on data migration basically). Just remember the later the version the more stable and feature rich the release. One other thing about connecting to MySQL or any other SQL server for that matter. However if your data set is small or reproducible then by all means proceed with the upgrade to the latest "stable" release.

Now back to your MySQL connect issue. Since the connect operation is your authentication into the DBMS it should be treated as an atomic operation. That is, pass or fail. Similarly the select is critical unless somehow your app can switch to a different DB which is highly unlikely. So.... here is an example you can customize that uses the die() function. From a networking perspective - MAKE SURE YOU CAN USE MySQL Query or MySQL Administrator with the user name, password, and DB so that you can prove the context. If it fails then you must GRANT access most likely.


<?php
define("DB_USER", "dbuser");
define("DB_PASSWORD", "dbuser99");
define("DB_HOST", "");
define("DB_NAME", "test");

// Connect to the MySQL server
$db_connection = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or
die('Could not connect to MySQL: ' . mysql_error());

// Select the database
mysql_select_db(DB_NAME) or die('Could not select the database: ' . mysql_error());
?>

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