[Solution] How to Fix Excel Connection Manager Failed with Error Code 0xc00f9304

Excel Connection Manager is an important tool that allows users to import, export and manipulate data in Excel. It helps to create data sources, configure and manage data connections, and access data from other sources. Unfortunately, this tool can sometimes fail with error code 0xc00f9304, making it difficult for users to access their data.

In this guide, we’ll go over how to fix Excel Connection Manager failed with error code 0xc00f9304. We’ll provide detailed instructions, as well as troubleshooting tips, so you can get your data connection going and start working with your data sources in no time.

Steps to Fix Excel Connection Manager Failed

  1. Close Excel, if it is open before you start troubleshooting.
  2. Go to the Windows Services window and make sure that the following services are set to automatic:
  • Windows Installer
  • Remote Procedure Call (RPC)
  • DCOM Server Process Launcher
  1. Go to your Control Panel, and then to Administrative Tools. Double-click Services, then scroll down to the “MSDTC” service in the list.
  2. Right-click “MSDTC” and select “Properties”. Set the startup type to “Automatic”, then Apply changes.
  3. Restart your computer.
  4. Open Excel to see if the connection was fixed.

Additional Troubleshooting Tips

  1. Make sure the version of Excel is up to date.
  2. Check your firewall settings, and any other security settings that might be blocking the connection.
  3. Make sure that UAC is turned on.
  4. Disable UAC, restart the computer, and then turn UAC back on.


Q1: What is Error Code 0xc00f9304?

Error Code 0xc00f9304 is an error code that indicates that Excel Connection Manager has failed or encountered an issue. It is usually associated with a lack of permissions or security settings that prevent Excel from connecting to a data source.

Q2: What causes Error Code 0xc00f9304?

Error code 0xc00f9304 can be caused by several things, including outdated versions of Excel, firewall settings, or UAC settings that may be blocking the connection.

Q3: How do I fix error code 0xc00f9304?

To fix error code 0xc00f9304, follow the steps in this guide. Make sure to check any firewall and security settings, and make sure Excel is up to date.

Q4: How important is it to keep Excel up to date?

It is very important to keep Excel up to date, as newer version may contain important updates and bug fixes. Additionally, newer versions of Excel may support more data sources or have better connection management tools.

Q5: What else should I do to ensure my Excel connections work properly?

In addition to keeping Excel up to date, you should also make sure there are no firewall or UAC settings blocking the connection. If you are having trouble creating or managing data sources, you should contact your IT professional for assistance.


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