{"id":187,"date":"2011-09-20T07:18:00","date_gmt":"2011-09-20T07:18:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/?p=187"},"modified":"2026-06-07T16:35:05","modified_gmt":"2026-06-07T11:05:05","slug":"error-when-logging-in-to-horde-fatal-error-db-error-connect-failed","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/error-when-logging-in-to-horde-fatal-error-db-error-connect-failed\/","title":{"rendered":"Error when logging in to Horde (“fatal error. DB Error: connect failed”)"},"content":{"rendered":"
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Introduction<\/h2>\n

If you encounter the error “Fatal Error. DB Error: connect failed”<\/strong> while logging in to Horde Webmail, it usually indicates that Horde cannot connect to its database. This issue can occur due to a stopped database service, incorrect database credentials, corrupted database tables, or server resource problems.<\/p>\n

In this guide, we’ll cover the common causes and solutions to restore Horde Webmail functionality.<\/p>\n

Error Message<\/h2>\n
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Fatal Error.\nDB Error: connect failed<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Common Causes<\/h2>\n
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  • MySQL\/MariaDB service is stopped.<\/li>\n
  • Incorrect database configuration in Horde.<\/li>\n
  • Database server is overloaded or unreachable.<\/li>\n
  • Corrupted Horde database tables.<\/li>\n
  • Insufficient disk space on the server.<\/li>\n
  • Firewall or network connectivity issues between Horde and the database server.<\/li>\n<\/ul>\n
    Troubleshooting Steps<\/h2>\n
    1. Verify MySQL\/MariaDB Service Status<\/h3>\n
    Check whether the database service is running:<\/p>\n
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    systemctl status mysql<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    or<\/p>\n
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    <\/div>\n<\/div>\n<\/div>\n
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    systemctl status mariadb<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    If the service is stopped, start it:<\/p>\n
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    <\/div>\n<\/div>\n<\/div>\n
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    systemctl start<\/span> mariadb<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Enable it at boot:<\/p>\n
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    systemctl enable mariadb<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    2. Test Database Connectivity<\/h3>\n
    Log in to the database manually:<\/p>\n
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    mysql -u<\/span> root -p<\/span><\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    If you cannot connect, review the database service logs:<\/p>\n
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    journalctl -xe<\/span><\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    or<\/p>\n
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    tail -f<\/span> \/var\/log\/mysqld.log<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    3. Check Available Disk Space<\/h3>\n
    A full disk can prevent database operations.<\/p>\n
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    df -h<\/span><\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    If disk usage is at 100%, free up space and restart the database service.<\/p>\n
    4. Verify Horde Database Configuration<\/h3>\n
    Review Horde configuration files and confirm:<\/p>\n
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    • Database hostname<\/li>\n
    • Database username<\/li>\n
    • Database password<\/li>\n
    • Database name<\/li>\n<\/ul>\n
      Common configuration locations:<\/p>\n
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      \/usr\/share\/horde\/config\/<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      or<\/p>\n
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      \/var\/www\/html\/horde\/config\/<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      5. Repair Corrupted Database Tables<\/h3>\n
      If database corruption is suspected:<\/p>\n
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      <\/div>\n<\/div>\n<\/div>\n
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      mysqlcheck -r<\/span> -u<\/span> root -p<\/span> --all-databases<\/span><\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      For InnoDB tables:<\/p>\n
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      mysqlcheck -o<\/span> -u<\/span> root -p<\/span> --all-databases<\/span><\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      6. Restart Web and Database Services<\/h3>\n
      After making changes:<\/p>\n
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      systemctl restart<\/span> httpd\nsystemctl restart<\/span> mariadb<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      For Debian\/Ubuntu:<\/p>\n
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      systemctl restart<\/span> apache2\nsystemctl restart<\/span> mariadb<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      7. Review Horde and Web Server Logs<\/h3>\n
      Check for detailed error messages:<\/p>\n
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      tail -f<\/span> \/var\/log\/httpd\/error_log<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      or<\/p>\n
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      tail -f<\/span> \/var\/log\/apache2\/error.log<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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      Also review Horde logs if available.<\/p>\n
      Conclusion<\/h2>\n
      The “Fatal Error. DB Error: connect failed”<\/strong> message in Horde Webmail is typically caused by a database connectivity issue. By checking the database service, verifying Horde configuration, ensuring adequate disk space, and reviewing logs, you can quickly identify and resolve the root cause.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
      <\/div>\n
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      <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n
      <\/div>\n","protected":false},"excerpt":{"rendered":"
      Introduction If you encounter the error “Fatal Error. DB Error: connect failed” while logging in to Horde Webmail, it usually 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