Can not connect to DDE server

[nikt52840492]

Im an IT person.

Quite a few of my users today report an error "Can not connect to DDE server" every time they try to open a PDF attachment in outlook.

I notices there are a lots of instances of Adobe reader running.

Killed all the tasks , disabled security features but the problem comes back intermittently without the DDE server error.

[Meenakshi Negi]

Hi Nikt,

As you have mentioned above that users get the error message "Can not connect to DDE server" while opening the PDF.

This error occurs when you have more than 1 process of Acrobat running

Please try the troubleshooting steps provided below:

1) make sure that the application is not open in the Task Manager.

• Go to the task manager by pressing Ctrl+Alt+Del
• Go to the processes in Task Manager
• End all processes related to Acrobat Reader
• Launch Acrobat Reader again.

2) Repair the application. Open Adobe Acrobat Reader and navigate to Help menu > Repair installation.

3) Check the file association on your system.

Check if this helps.

If you still experience the issue, please share the following details:

What is the dot version of the Adobe application used to open the PDF?

Are you on Windows or Mac? OS version installed on your machine?

Let us know if you need any help.

Regards,

Meenakshi

[AshuMittal]

Hi nikt52840492​

Sorry for the inconvenience.

We are aware of this issue and the fix is currently undergoing internal validations. We will confirm once the patch is available for general public.

Thanks for your patience,

-ashu

[AshuMittal · Accepted solution]

Hi all,

Adobe Acrobat and Reader official update containing the fix for this issue is now available. This update will be automatically pushed to all existing installations of Acrobat and Reader. If you want, you may also manually trigger the update by opening the application and going to Help > Check for Updates.

More information about this release is here: Acrobat Help | Release notes | Acrobat DC and Acrobat Reader DC | Update

Please try it out and let us know your feedback.

Thanks for your patience and support!

-ashu