523:523 error with 2019.021.20058 and 2020.006.20034 of Acrobat Reader DC

[DerekHowell]

Hi folks

We have just started getting reports of users being unable to view PDFs within Internet Explorer. Whenever they click on PDF links, they get the infamous 523:523 error. We have tried the following:-

If we disable the add-in, Reader pops up and correctly displays the PDF.

If we turn Protected Mode off, the PDF is displayed in Internet Explorer.

Whitelisting acrord32.exe has also been suggested. None of these solutions is acceptible. Does anyone know why this has suddenly started affecting users? What do Adobe reccomend as a solution?

Kind regards

Derek

[MeenakshiNegi]

Hi Derek, 

Thank you for reaching out.

As you get the error 523:523, please provide more detals as asked below:

- Check if you get the same error when try to open PDFs from alternate browser.

- Did you make any recent changes after which the issue started occuring? 

- Are you using the application on the work machines or personal?

- Does this issue occurs with any PDF that you try to open from the browser?

- Share the OS and IE version installed on the machine.

We will be waiting for your response.

Regards,

Meenakshi

[DerekHowell]

Hi Meenakshi

No, this only affects Internet Explorer. Chrome works fine.

No recent changes made as far as we are aware.

Yes, this affects all PDFs.

This is affecting Windows 10 1709 and 1909 with IE version 11.0.16299.371 and 11.0.18362.1.