Fix Acrobat Reader Cannot Sign with Digital ID on Mac (Error CGetSigninParams-4001)
Question details
Users are unable to sign PDF documents using a digital ID in Adobe Acrobat Reader DC on macOS, encountering 'Bad parameter' or 'Unknown error' messages.
- Product
- Adobe Acrobat Reader DC
- Device & OS
- macOS
- Scenario
- Applying a digital signature to a PDF document using a certificate or digital ID file.
- Observed behavior
- The application fails to apply the digital signature, displaying a 'Bad parameter', 'Unknown error', or explicitly referencing 'CGetSigninParams-4001'.
Ensure you have the correct password for your digital ID file (.pfx or .p12) and that the certificate has not expired.
Re-add the Digital ID in Acrobat Preferences
Removing and re-importing the digital ID refreshes the certificate path and often resolves the 'Bad parameter' error.
The connection between Acrobat and your digital ID file can occasionally become corrupted on macOS, especially after system updates. Manually re-adding the ID forces Acrobat to re-verify the certificate parameters.
Launch Adobe Acrobat Reader DC on your Mac. Click on 'Acrobat Reader' in the top menu bar and select 'Preferences'.
In the left-hand sidebar, click on 'Signatures'. Under the 'Identities & Trusted Certificates' section, click the 'More' button.
Select 'Digital IDs' on the left. Highlight the problematic digital ID and click 'Remove ID' or 'Detach File'.
Click the 'Add ID' button. Follow the on-screen prompts to browse for your .pfx or .p12 digital ID file, enter your password, and import it back into Acrobat.
Update Adobe Acrobat Reader DC
Installing the latest software updates can fix known bugs related to macOS keychain access and signature parameters.
Recreate or Reissue the Digital ID
If the digital ID file itself is corrupted, generating a new one is necessary to restore signing capabilities.
Sign PDFs Effortlessly with WPS Office
Avoid Adobe Acrobat compatibility errors by using WPS Office. Our built-in PDF tool provides a lightweight, seamless way to add digital signatures and manage your documents securely on Mac.
- 1. Open Your PDF: Launch WPS Office on your Mac and open the PDF document you need to sign.
- 2. Access the Signature Tool: Navigate to the 'Protect' or 'Fill & Sign' tab on the top ribbon and select the 'Sign Document' option.
- 3. Apply Your Signature: Choose to create a new signature or import an existing digital ID, place it on the document, and save your securely signed PDF.
Frequently Asked Questions
What does the CGetSigninParams-4001 error mean in Acrobat?
This error code typically indicates a failure to read the digital ID's parameters during the signing process. It usually stems from a corrupted certificate file, an incorrect password, or software conflicts on macOS.
Can I use Mac's Keychain for digital signatures in Acrobat?
Yes, Acrobat Reader can be configured to use digital IDs stored in the Apple Keychain. However, you must ensure the Keychain permissions for that specific certificate are set to 'Always Trust' for it to work correctly.
Why does my digital ID say 'Bad parameter' when I try to sign?
A 'Bad parameter' error occurs when Acrobat cannot process the data within your digital ID file. This often happens if the .pfx/.p12 file was exported incorrectly or if there is a mismatch between the certificate's encryption and the Acrobat version.
