Data Import & Export

How to Fix Excel 2409 PostgreSQL Connection String Errors

Ayan Masood Sep 27, 2026 868 views

Question details

The user needs to resolve an invalid key=value argument error when establishing a connection from Excel 365 to a PostgreSQL database using VBA.

How to Fix Excel 2409 PostgreSQL Connection String Errors

Product: Microsoft Excel 365
Device & OS: not provided
Scenario: Connecting to a PostgreSQL database via VBA in Excel 365 version 2409.
Observed behavior: Excel throws an invalid key=value argument error, frequently caused by an incorrectly constructed application name parameter in the connection string.

Before you start

Verify that your system has the correct PostgreSQL ODBC driver installed, and make sure to copy and back up your current VBA script before making any modifications.

Solution 1Recommended

Review and Correct the VBA Connection String

Check your VBA-generated connection string for syntax errors, unexpected spaces, and improperly formatted parameters to resolve the connection issue.

In Excel 365 version 2409, the database driver is highly sensitive to the formatting of the connection string. An invalid 'key=value' argument usually indicates a typo or unexpected whitespace within the parameters, particularly around the Application Name.

Open the VBA Editor

Launch your Excel workbook and press 'Alt + F11' to open the Visual Basic for Applications (VBA) editor.

Locate the Connection Code

In the Project Explorer, find and double-click the module containing your PostgreSQL connection string.

Inspect Parameters

Carefully review the connection string for missing semicolons, unexpected spaces before or after equal signs, and ensure the 'Application Name' parameter is correctly quoted or formatted according to your ODBC driver's documentation.

Test the Modified Script

Save your changes, close the VBA editor, and run your macro again to verify if the connection succeeds without throwing the invalid key=value error.

Review and Correct the VBA Connection String

Proper Syntax Matters: Ensuring strict adherence to the PostgreSQL ODBC connection string format is the most effective way to prevent argument errors.

Solution 2

Consult Stack Overflow for Advanced Support

If standard troubleshooting does not work, post a detailed query on developer communities like Stack Overflow with the correct tags.

Free Microsoft Office alternative

Try WPS Office for a Streamlined Spreadsheet Experience

Dealing with complex VBA errors and version-specific bugs in Microsoft Office can be time-consuming. Consider WPS Office as a free, lightweight, and highly compatible alternative for managing your spreadsheets and daily tasks with ease.

1. Download the Installer: Visit the official WPS website and download the free WPS Office suite for your operating system.
2. Install WPS Office: Run the downloaded setup file and follow the simple on-screen instructions to install the application.
3. Open Your Files: Launch WPS Spreadsheets and instantly open your existing Excel workbooks without losing formatting or data.

Free and lightweight Microsoft Office alternativeHighly compatible with Microsoft Excel (.xlsx, .xls) formatsFamiliar user interface for quick and seamless migrationBuilt-in robust tools for data analysis and visualization

microsoft office alternative - wps office

Frequently Asked Questions

What causes the invalid key=value argument error in Excel VBA?

This error occurs when the PostgreSQL ODBC driver encounters malformed syntax in the connection string, such as missing semicolons, stray spaces, or an improperly formatted application name parameter.

How do I check my exact version of Excel 365?

Open Excel, click on 'File', select 'Account' from the bottom left, and look under the 'About Excel' section. You will see your version number (e.g., Version 2409) and build details.

Can I connect to a PostgreSQL database without writing VBA code?

Yes, you can use Excel's built-in 'Power Query' feature. Go to the 'Data' tab, select 'Get Data', choose 'From Database', and select 'From PostgreSQL Database' to establish a connection through a visual interface.

Excel & Data Problems