"Cannot log in to the MySQL server" without code using phpMyAdmin on CentOS7

Posted November 21, 2018 34.7k views

I’ve set up a new CentOS 7 server with Apache, MySQL and phpMyAdmin using Digital Ocean’s guides.
However, when I try to log in to phpMyAdmin via the browser, I get the message “Cannot log in to the MySQL server” without any error code.

For testing purposes I’ve set the IP addresses in phpMyAdmin.conf to Require all granted.

I have two accounts in MySQL, namely the root user and a user ‘niels’, which I gave all permissions.
Logging in to MySQL via the command line works fine for both accounts. Only the phpMyAdmin web version is doing something unexpected.

Thank you!

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5 answers

Assuming MySQL 8.

  ALTER USER root IDENTIFIED WITH mysql_native_password BY 'PASSWORD';

Some applications are having trouble with caching _sha2 _password method. Above sets the credentials to use the native one.


What did you use as your “host” in the PHPMyAdmin config? Depending on what you have there, the system (/etc/hosts) could interpret it differently and all of a sudden MySQL “thinks” the connection is remote. For which you probably don’t have the grants. Sometimes a mere difference of “” and “localhost” could confuse things. Try setting the host to “” to skip /etc/hosts and rule this issue out.

The result of that command looks like this:
tcp6 0 0 :::33060 :::* LISTEN 3690/mysqld
tcp6 0 0 :::3306 :::* LISTEN 3690/mysqld

phpMyAdmin does not give any code. Just the message.

Can you post the content of your

  • I’ve left out the authentication secret and some default comments.

     * Server(s) configuration
    $i = 0;
    // The $cfg['Servers'] array starts with $cfg['Servers'][1].  Do not use
    // $cfg['Servers'][0]. You can disable a server config entry by setting host
    // to ''. If you want more than one server, just copy following section
    // (including $i incrementation) serveral times. There is no need to define
    // full server array, just define values you need to change.
    $cfg['Servers'][$i]['host']          = ''; // MySQL hostname or IP address
    $cfg['Servers'][$i]['port']          = '';          // MySQL port - leave blank for default port
    $cfg['Servers'][$i]['socket']        = '';          // Path to the socket - leave blank for default socket
    $cfg['Servers'][$i]['connect_type']  = 'tcp';       // How to connect to MySQL server ('tcp' or 'socket')
    $cfg['Servers'][$i]['extension']     = 'mysqli';    // The php MySQL extension to use ('mysql' or 'mysqli')
    $cfg['Servers'][$i]['compress']      = FALSE;       // Use compressed protocol for the MySQL connection
                                                        // (requires PHP >= 4.3.0)
    $cfg['Servers'][$i]['controluser']   = '';          // MySQL control user settings
                                                        // (this user must have read-only
    $cfg['Servers'][$i]['controlpass']   = '';          // access to the "mysql/user"
                                                        // and "mysql/db" tables).
                                                        // The controluser is also
                                                        // used for all relational
                                                        // features (pmadb)
    $cfg['Servers'][$i]['auth_type']     = 'cookie';    // Authentication method (config, http or cookie based)?
    $cfg['Servers'][$i]['user']          = 'testuser';          // MySQL user
    $cfg['Servers'][$i]['password']      = 'password';          // MySQL password (only needed
                                                        // with 'config' auth_type)
    $cfg['Servers'][$i]['only_db']       = '';          // If set to a db-name, only
                                                        // this db is displayed in left frame
                                                        // It may also be an array of db-names, where sorting order is relevant.
    $cfg['Servers'][$i]['hide_db']       = '';          // Database name to be hidden from listings
    $cfg['Servers'][$i]['verbose']       = '';          // Verbose name for this host - leave blank to show the hostname
    $cfg['Servers'][$i]['pmadb']         = '';          // Database used for Relation, Bookmark and PDF Features
                                                        // (see scripts/create_tables.sql)
                                                        //   - leave blank for no support
                                                        //     DEFAULT: 'phpmyadmin'
    $cfg['Servers'][$i]['bookmarktable'] = '';          // Bookmark table
                                                        //   - leave blank for no bookmark support
                                                        //     DEFAULT: 'pma_bookmark'
    $cfg['Servers'][$i]['relation']      = '';          // table to describe the relation between links (see doc)
                                                        //   - leave blank for no relation-links support
                                                        //     DEFAULT: 'pma_relation'
    $cfg['Servers'][$i]['table_info']    = '';          // table to describe the display fields
                                                        //   - leave blank for no display fields support
                                                        //     DEFAULT: 'pma_table_info'
    $cfg['Servers'][$i]['table_coords']  = '';          // table to describe the tables position for the PDF schema
                                                        //   - leave blank for no PDF schema support
                                                        //     DEFAULT: 'pma_table_coords'
    $cfg['Servers'][$i]['pdf_pages']     = '';          // table to describe pages of relationpdf
                                                        //   - leave blank if you don't want to use this
                                                        //     DEFAULT: 'pma_pdf_pages'
    $cfg['Servers'][$i]['column_info']   = '';          // table to store column information
                                                        //   - leave blank for no column comments/mime types
                                                        //     DEFAULT: 'pma_column_info'
    $cfg['Servers'][$i]['history']       = '';          // table to store SQL history
                                                        //   - leave blank for no SQL query history
                                                        //     DEFAULT: 'pma_history'
    $cfg['Servers'][$i]['verbose_check'] = TRUE;        // set to FALSE if you know that your pma_* tables
                                                        // are up to date. This prevents compatibility
                                                        // checks and thereby increases performance.
    $cfg['Servers'][$i]['AllowRoot']     = TRUE;        // whether to allow root login
    $cfg['Servers'][$i]['AllowDeny']['order']           // Host authentication order, leave blank to not use
                                         = '';
    $cfg['Servers'][$i]['AllowDeny']['rules']           // Host authentication rules, leave blank for defaults
                                         = array();
    $cfg['Servers'][$i]['AllowNoPassword']              // Allow logins without a password. Do not change the FALSE
                                         = FALSE;       // default unless you're running a passwordless MySQL server
    $cfg['Servers'][$i]['designer_coords']              // Leave blank (default) for no Designer support, otherwise
                                         = '';          // set to suggested 'pma_designer_coords' if really needed
    $cfg['Servers'][$i]['bs_garbage_threshold']         // Blobstreaming: Recommented default value from upstream
                                         = 50;          //   DEFAULT: '50'
    $cfg['Servers'][$i]['bs_repository_threshold']      // Blobstreaming: Recommented default value from upstream
                                         = '32M';       //   DEFAULT: '32M'
    $cfg['Servers'][$i]['bs_temp_blob_timeout']         // Blobstreaming: Recommented default value from upstream
                                         = 600;         //   DEFAULT: '600'
    $cfg['Servers'][$i]['bs_temp_log_threshold']        // Blobstreaming: Recommented default value from upstream
                                         = '32M';       //   DEFAULT: '32M'
     * End of servers configuration
     * Directories for saving/loading files from server
    $cfg['UploadDir'] = '/var/lib/phpMyAdmin/upload';
    $cfg['SaveDir']   = '/var/lib/phpMyAdmin/save';
     * Disable the default warning that is displayed on the DB Details Structure
     * page if any of the required Tables for the relation features is not found
    $cfg['PmaNoRelation_DisableWarning'] = TRUE;
     * phpMyAdmin 4.4.x is no longer maintained by upstream, but security fixes
     * are still backported by downstream.
    $cfg['VersionCheck'] = FALSE;