Adobe open and tell the pdf is not a readable file

Product:
Cognos Controller 10.4.2 fix pack 2
CONTRL_UPDATE_version=CCR-AW64-ML-RTM-10.4.2200.70-0
CONTRL_UPDATE_name=IBM Cognos Controller Update
Microsoft Windows 2019 server

Issue:

When run a standard report in Cognos Controller program, the adobe program starts up and give an error message.

or error like this when open the pdf report. That is if the report is shown both in cognos controller and in a separate adobe reader.

 

Solution:

Change the Cognos Controller server to use the internal pdf viewer.

Steps:
1. Obtain a short amount of downtime (nobody logged onto Controller)
2. Logon to the Controller application server
3. Browse to the folder C:\Program Files\ibm\cognos\ccr_64\ControllerProxyServer
4. As a precaution, create a backup copy of the file:  web.config
5. Use Notepad to edit the file   web.config
6. Locate the section   <appSettings>
7. Add the following line into that section:
    <add key="useInternalPdfViewer" value="true" />
Save the file, and restart the server to test again.
More Information: