1. Solution to the error "Acrobat cannot connect to a DDE could not connect to Server
It comes to PDF's, it's hard way to Adobe's Acrobat by. The Software offers many functions for the platform-independent file format. For example, the merging of many files into a single PDF. And this is exactly where you can be with this error faced. We offer you two different proposals for a solution to the Problem.
- Open the registry Editor. Click with the right mouse button in the bottom left of the Windowsicon, and select Run from.
- Now enter regedit in the box and click OK. You may need to confirm the time you Open the editor again.
- Enter now at the top of the Search bar on the Computer\HKEY_CLASSES_ROOT\acrobat\shell\open\ddeexec\application and confirm with [Enter].
- Tip: Create you of application a backup on the Desktop. Right click on application and then select Expo animals from.
- Make sure that you application in the Editor was selected, and now click with the right mouse button in the right panel on the default. Select modify and change the value of: AcroviewA18 in AcroviewR18.
- Now close the Editor and restart Acrobat. The Problem should be fixed. If not, continue with the next solution.
- Tip: Adobe recommends that, before a backup of the Windows Registry to create.

 The error "Acrobat cannot connect to a DDE could-Server" you can solve restore them in the Registry 
 
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2. Solution: It can also be due to the anti-virus program
Set whether you turn on your PC anti-virus program to use.
- Uncheck If the program and check whether the error message appears still.
- The error still exists, make sure that you have installed the latest Version of Acrobat.
- To do this, open Acrobat and click the top of the bar to help. Here you can select check for Updates.... and follow, where appropriate, the instructions.

 Keep Acrobat up to date
 
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