Resolve errors related to the AcroCEF/RdrCEF processes of Acrobat or Acrobat Reader

AcroCEF.exe/RdrCEF.exe are inseparable processes of Adobe Acrobat and Acrobat Reader. They handle multiple integral aspects of the application, such as network interaction and Document Cloud services (Fill and Sign, Send For Signature, Share for View/Review, and so on). For more information, see What are RdrCEF.exe and AcroCEF.exe processes?

If these processes do not function properly, an error message is displayed while using any of the services dependent on the processes.

AcroCEF/RdrCEF error dialog

To fix the error, try the following solutions in the order they appear below.

Solution 1: Restart Acrobat/Acrobat Reader

Quit Adobe Acrobat/Acrobat Reader, and relaunch the application.

Solution 2: Whitelist the AcroCEF/RdrCEF processes in your antivirus software

Antivirus software can interfere or block the AcroCEF/RdrCEF processes. The processes reside in AcroCEF folder. Add the folder to the exception list of your antivirus software.


The steps below explain how to add exceptions to Avast antivirus software. If you are using different antivirus software, follow the instructions on the respective website, and add the AcroCEF folder to the exception list accordingly.

  1. Open Avast antivirus. Click Menu and then click Settings.

    Avast settings

  2. Click General > Exceptions, and then click Add Exception.

    Add Exception

  3. Add path of the AcroCEF folder as below:

    • For Adobe Acrobat DC: C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\AcroCEF
    • For Acrobat Reader DC:  C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroCEF
    Path to AcroCEF folder

  4. Click Add Exception. The AcroCEF folder is now whitelisted.

Solution 3: Repair Acrobat/Acrobat Reader installation

  1. Open the application.

  2. On the application menu, click Help > Repair Installation.

    After the repair process is complete, restart your computer.

Solution 4: Uninstall and reinstall Acrobat/Acrobat Reader

You can sometimes resolve the error by uninstalling and reinstalling Acrobat.

  1. Uninstall Acrobat/Acrobat Reader from your computer:

    1. Open the Run command dialog by pressing the Windows key and the R key.
    2. In the dialog, type Control Panel and click OK.
    3. In the Control Panel, select Program and Features, and then select Acrobat/Acrobat Reader from the list of installed programs.
    4. Click Uninstall and follow the prompts to uninstall Acrobat/Acrobat Reader.
  2. Reinstall the latest version of Acrobat/Acrobat Reader on your computer:

    1. Go to the Adobe Reader Downloads page and click Download Acrobat Reader.
    2. Allow the Download Manager sufficient time to download all necessary installation files. Then follow the prompts to install Reader.
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