How can I connect adobe to server DDE?
Try the solutions given below:-
Solution 1) (This error occurs when you have more than 1 process of Acrobat running)
Solution 2) Open Acrobat navigate to Help menu & Repair the installation.
Solution 3) Check the file association on your system.
Solution 4) Navigating to HKEY_CLASSES_ROOT\acrobat\shell\open\ddeexec\application and changing the Key "AcroviewA11" to "AcroviewR11.