QuickBooks Bank Error 105 typically occurs when there is an issue with the sign-in credentials for your bank account within QuickBooks. To address this error, you can follow these general troubleshooting steps:

Verify your bank credentials: Double-check the username and password you are using to log in to your bank account. Ensure they are correct and haven't changed recently.

Update QuickBooks: Make sure you are using the latest version of QuickBooks. Go to the Help menu and select "Update QuickBooks" to install any available updates.

Clear cache and temporary internet files: Clearing your browser's cache and temporary internet files can help resolve connection issues. Open your preferred browser and clear the cache and cookies.