If you try to open PDFs or merge documents using Adobe Acrobat but receive an error message saying that “Acrobat failed to connect to a DDE server”, what will you do? If you don’t know, then you can read this post written by MiniTool to find several methods to fix it.

You may receive the error message saying that “Acrobat failed to connect to a DDE server” when you try to merge several files into one PDF. So how to fix this error? The methods are shown below.

Method 1: Restart the Acrobat Software Completely

If the Adobe Acrobat software isn’t running normally, then you can receive the “Adobe failed to connect to a DDE server” error. Therefore, you can fix the error simply by restarting the Acrobat software completely.

Here is the tutorial:

Step 1: Press the Ctrl + Shift + Esc keys at the same time to open Task Manager.

Step 2: Right-click each of the processes or tasks related to Acrobat and then choose End task.

Step 3: Restart Acrobat and then check if the error is gone.

Method 2: Repair the Acrobat Software Installation

There may be some corrupted file related to your Acrobat software when the “Adobe failed to connect to a DDE server” error occurs. You can try the following steps to fix the error.

Step 1: Press the Win + R keys at the same time to open the Run box.

Step 2: Enter appwiz.cpl in the box and then click OK to open Programs and Features.

Step 3: Right-click Adobe Acrobat to choose Change.

Step 4: Choose the Repair option and then click Next.

Step 5: Wait for the repair process to finish and then click Finish to exit.

Step 6: Restart Acrobat and then check if the error still persists.

Method 3: Update the Acrobat Software

If your Acrobat is out-of-date, then the “Acrobat failed to connect to a DDE server Windows 10” error will appear. Thus, you should update your Acrobat to the latest version. Here is the tutorial:

Step 1: Open Programs and Features.

Step 2: Right-click Adobe Acrobat to choose Uninstall. Click Yes to confirm.

Step 3: Restart Windows after uninstalling Adobe Acrobat and then go to the official Adobe Acrobat website to download the latest version of Acrobat.

Step 4: Install the Acrobat and then launch it to check if the error is fixed.

Method 4: Temporarily Disable the Antivirus Software

The culprit of the “Acrobat failed to connect to a DDE server” error may be the third-party antivirus software. Thus, temporarily disabling the antivirus software may help you solve the problem.

And if this method works, then you’d better install a piece of different antivirus software.

Method 5: Edit the Registry

Editing the registry is the Adobe’s official method to fix the “Acrobat failed to connect to a DDE server” error. Now follow the guide to do that:

Note: It is dangerous to edit the registry, so you’d better back up the registry key you want to edit in advance. Then you can read this post to get the detail instructions - How to Back up Individual Registry Keys Windows 10?

Step 1: Press the Win + R keys at the same time to open the Run box.

Step 2: Enter regedit in the box and then click OK. Click Yes.

Step 3: In the Registry Editor window, navigate to Computer\HKEY_CLASSES_ROOT\acrobat\shell\open\ddeexec\application.

edit the registry

Step 4: Right-click the key on the left of the Registry Editor’s window and then click Modify….

Step 5: Change the Value data AcroviewA18 or AcroviewA19 to AcroviewR18 or AcroviewR19. Click OK to save changes.

Note: The value of A and R depends on the version of Acrobat installed. For example, for Acrobat 2018, the value will be A18.

Step 6: Reboot your computer and then check if the error still exists.

Bottom Line

To sum up, when you meet the “Acrobat failed to connect to a DDE server” error, then you can use these methods mentioned in this post to fix it.

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