用户 'root'@'localhost' 访问被拒绝（使用密码：YES）（Mysql::Error）

Question

I tried to deploy web application on my server and I am getting this mysql database exception

Access denied for user 'root'@'localhost' (using password: YES) (Mysql::Error)

I tried to access the database from the command prompt using mysql -u root -p I am able to do all the database operations.

what is the error

java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:771)
    at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3649)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1176)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2558)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at java.sql.DriverManager.getConnection(DriverManager.java:620)
    at java.sql.DriverManager.getConnection(DriverManager.java:200)
    at com.mpigeon.DbConnection.DbConn(DbConnection.java:26)
    at com.mpigeon.CheckLoginHome.doGet(CheckLoginHome.java:39)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Answer 1

You need to grant access to root from localhost. Check this ubuntu help

Answer 2

try using root like..

mysql -uroot

then you can check different user and host after you logged in by using

select user,host,password from mysql.user;

Answer 3

检查您是否在密码中放置了空格。

Answer 4

I faced the same error after upgrading MySQL server from 5.1.73 to 5.5.45 There is another way to fix that error.

In my case I was able to connect to MySQL using root password but MySQL actively refused to GRANT PRIVILEGES to any user;

1. Connect to MySQL as root

    mysql -u root -p

   then enter your MySQL root password;

2. Select database;

    use mysql;

3. Most probably there is only one record for root in mysql.user table allowing to connect only from localhost (that was in my case) but by the default there should be two records for root, one for localhost and another one for 127.0.0.1 ;

4. Create additional record for root user with Host='127.0.0.1' if it's not there;

    SET @s = CONCAT('INSERT INTO mysql.user SELECT ', REPLACE((SELECT GROUP_CONCAT(COLUMN_NAME) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'user' AND TABLE_SCHEMA = 'mysql') ,"Host","'127.0.0.1'"), ' FROM mysql.user WHERE User="root"'); PREPARE stmt FROM @s; EXECUTE stmt;

5. Additionally to that you can execute mysql_upgrade -u -p to see if everything is ok.

Answer 5

From my answer here , thought this might be useful:

I tried many steps to get this issue corrected. There are so many sources for possible solutions to this issue that is is hard to filter out the sense from the nonsense. I finally found a good solution here :

Step 1: Identify the Database Version

$ mysql --version

You'll see some output like this with MySQL:

$ mysql  Ver 14.14 Distrib 5.7.16, for Linux (x86_64) using  EditLine wrapper

Or output like this for MariaDB:

mysql  Ver 15.1 Distrib 5.5.52-MariaDB, for Linux (x86_64) using readline 5.1

Make note of which database and which version you're running, as you'll use them later. Next, you need to stop the database so you can access it manually.

Step 2: Stopping the Database Server

To change the root password, you have to shut down the database server beforehand.

You can do that for MySQL with:

$ sudo systemctl stop mysql

And for MariaDB with:

$ sudo systemctl stop mariadb

Step 3: Restarting the Database Server Without Permission Checking

If you run MySQL and MariaDB without loading information about user privileges, it will allow you to access the database command line with root privileges without providing a password. This will allow you to gain access to the database without knowing it.

To do this, you need to stop the database from loading the grant tables, which store user privilege information. Because this is a bit of a security risk, you should also skip networking as well to prevent other clients from connecting.

Start the database without loading the grant tables or enabling networking:

$ sudo mysqld_safe --skip-grant-tables --skip-networking &

The ampersand at the end of this command will make this process run in the background so you can continue to use your terminal.

Now you can connect to the database as the root user, which should not ask for a password.

$ mysql -u root

You'll immediately see a database shell prompt instead.

MySQL Prompt

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

MariaDB Prompt

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]>

Now that you have root access, you can change the root password.

Step 4: Changing the Root Password

mysql> FLUSH PRIVILEGES;

Now we can actually change the root password.

For MySQL 5.7.6 and newer as well as MariaDB 10.1.20 and newer , use the following command:

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

For MySQL 5.7.5 and older as well as MariaDB 10.1.20 and older , use:

mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('new_password');

Make sure to replace new_password with your new password of choice.

Note: If the ALTER USER command doesn't work, it's usually indicative of a bigger problem. However, you can try UPDATE ... SET to reset the root password instead.

[IMPORTANT] This is the specific line that fixed my particular issue:

mysql> UPDATE mysql.user SET authentication_string = PASSWORD('new_password') WHERE User = 'root' AND Host = 'localhost';

Remember to reload the grant tables after this.

In either case, you should see confirmation that the command has been successfully executed.

Query OK, 0 rows affected (0.00 sec)

The password has been changed, so you can now stop the manual instance of the database server and restart it as it was before.

Step 5: Restart the Database Server Normally

The tutorial goes into some further steps to restart the database, but the only piece I used was this:

For MySQL, use: $ sudo systemctl start mysql

For MariaDB, use:

$ sudo systemctl start mariadb

Now you can confirm that the new password has been applied correctly by running:

$ mysql -u root -p

The command should now prompt for the newly assigned password. Enter it, and you should gain access to the database prompt as expected.

Conclusion

You now have administrative access to the MySQL or MariaDB server restored. Make sure the new root password you choose is strong and secure and keep it in safe place.

Answer 6

This error happens if you did not set the password on install, in this case the mysql using unix-socket plugin.

But if delete the plugin link from settings (table mysql.user) will other problem. This does not fix the problem and creates another problem. To fix the deleted link and set password ("PWD") do:

1) Run with --skip-grant-tables as said above.

If it doesnt works then add the string skip-grant-tables in section [mysqld] of /etc/mysql/mysql.conf.d/mysqld.cnf. Then do sudo service mysql restart.

2) Run mysql -u root -p, then (change "PWD"):

update mysql.user 
    set authentication_string=PASSWORD("PWD"), plugin="mysql_native_password" 
    where User='root' and Host='localhost';    
flush privileges;

quit
then sudo service mysql restart. Check: mysql -u root -p.

Before restart remove that string from file mysqld.cnf, if you set it there.

@bl79 is the author of this answer, i've just reposted it, because it does help!

Answer 7

My application is using Mura CMS and I faced this issue. However the solution was the password mismatch between my mysql local server and the password in the config files. As soon as I synched them it worked.

Answer 8

I solved this problem by deleting the empty users creating by MySQL. I only have root user and my own user. I deleted the rest.

Answer 9

Update user table in mysql DB. And set some password where it is blank, i was using root user so i set password for root user.

update mysql.user set password = PASSWORD('123456') where password = '';
flush privileges;

And then again tried from ATG CIM by providing password and it worked fine.

http://i.stack.imgur.com/3Lchp.png

Answer 10

I got this problem today while installing SugarCRM (a free CRM).

The system was not able to connect to the database using the root user. I could definitively log in as root from the console... so what was the problem?

I found out that in my situation, I was getting exactly the same error, but that was because the password was sent to mysql directly from the $_POST data, in other words, the < character from my password was sent to mysql as < which means the password was wrong.

Everything else did not help a bit. The list of users in mysql were correct, including the anonymous user (which appears after the root entries.)

Answer 11

I googled a lot but did not find a definite answer to my problem. I used KeyPass to generate a strong password and could use it successfully on mysql workbench to connect but not from the command line. So I changed the psw to an easy one and it worked on the command line. I have managed to create a strong password that was able to connect from the terminal. So my advise is, try with an easy password first before trying all kind of things.

Answer 12

I was running UTs and I started receiving error messages. I am not sure what was the problem. But when I changed my encoding style in INTELLIJ to UTF8 it started working again.

access denied for user 'root'@'localhost' (using password yes) hibernate

this is my URL db.url=jdbc:mysql://localhost:3306/somedb?useUnicode=true&connectionCollation=utf8_general_ci&characterSetResults=utf8&characterEncoding=utf8

Answer 13

Add a user option in msyql.

GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION;

and this link will be useful.

Answer 14

Update the empty password in the table mysql.user of mysql

use mysql;
select host,user,password from mysql.user;
update mysql.user set password = PASSWORD('123456') where password = '';
flush privileges;