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Fix MySQL ODBC Error -7745 in Microsoft Access
Question details
The user encounters a reserved error -7745 when attempting to link MySQL tables to a Microsoft Access front end.
- Product
- Microsoft Access
- Device & OS
- not provided
- Scenario
- Linking MySQL database tables to Microsoft Access using an ODBC connection.
- Observed behavior
- Microsoft Access produces a reserved error -7745 and fails to link the tables, despite the MySQL server being reachable and other clients connecting successfully.
Verify your Microsoft Access architecture by navigating to File > Account > About Access, as your MySQL ODBC driver must perfectly match whether your Access installation is 32-bit or 64-bit.
Match ODBC Driver Architecture to Microsoft Access
Ensure that the bitness (32-bit or 64-bit) of the installed MySQL ODBC driver matches the architecture of your Microsoft Access installation.
Microsoft Access can only interface with ODBC drivers that share the same architecture. A common cause for error -7745 is attempting to use a 64-bit ODBC driver with a 32-bit version of Access, or vice versa.
Open Microsoft Access, click on 'File', select 'Account', and then click 'About Access'. Note whether it states 32-bit or 64-bit at the end of the first line.
If you have the incorrect driver installed, open the Windows Control Panel, navigate to 'Programs and Features', and uninstall the current MySQL ODBC driver.
Download the MySQL ODBC driver that matches your Access architecture from the official MySQL website and run the installer.
Recreate and Test the System DSN
Create a fresh Data Source Name (DSN) to ensure all connection parameters, such as server name, port, and credentials, are correctly configured.
Review MySQL Logs and Compare Connection Settings
Identify deeper configuration issues by reviewing logs or comparing settings with machines that are successfully connecting.
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Frequently Asked Questions
Why does Microsoft Access require a specific bitness for the ODBC driver?
Microsoft Access is a specific Windows process (either 32-bit or 64-bit) and it can only load drivers into memory that share its exact architecture. A mismatch prevents Access from communicating with the ODBC driver, resulting in connection errors.
Can Windows Firewall rules cause ODBC error -7745?
Yes. Even if the server is accessible over the broader network, the specific port used by MySQL (usually port 3306) must be open in both the client and server firewalls for the ODBC connection to exchange data properly.
The ODBC test connection is successful, so why does linking tables still fail?
A successful ODBC test only confirms network reachability and basic login credentials. Linking tables in Access requires additional permissions to read database metadata and schema structures. Ensure the database user has sufficient privileges to read table structures in MySQL.
