How to Fix Certificate Revocation Errors When Validating PDF Signatures
Question details
The user needs to resolve an error where a PDF reader cannot verify a signer's identity due to certificate revocation validation issues.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Validating digital signatures on a secure PDF document.
- Observed behavior
- An error occurs stating the signer's identity cannot be checked, even though root and intermediate certificates appear to be correctly installed.
Ensure your device has an active internet connection, as signature validation requires reaching online certificate revocation lists (CRL) or OCSP services to confirm the certificate is still valid.
Verify the Certificate Chain and Revocation Settings
Checking the certificate chain and the PDF reader's revocation settings ensures that the software is properly configured to reach validation servers.
Digital signature validation requires the software to trust the entire certificate chain and verify its current status online. If revocation checking is disabled or misconfigured, validation will fail.
Launch Adobe Acrobat and navigate to Edit > Preferences (Windows) or Acrobat > Preferences (Mac).
Select 'Signatures' from the Categories on the left panel, then click the 'More' button under the Verification section.
Ensure that the option to verify signatures when the document is opened is checked to prompt automatic validation.
Under the Windows Integration section, check the boxes allowing the software to trust certificates in the Windows Certificate Store for validating signatures, which can help bypass isolated trust issues.
Update Software and Verify Network Access
Outdated software or strict network firewalls blocking access to the Certificate Authority's revocation servers can cause validation failures.
Use WPS Office for Seamless PDF Management
WPS Office includes a powerful built-in PDF reader and editor that handles standard digital signatures and encrypted documents smoothly. It offers an intuitive interface to view, sign, and manage PDFs without complicated configuration errors, all while keeping your workflow lightweight and efficient.
- 1. Download WPS Office: Download and install WPS Office for free from the official website.
- 2. Launch the PDF Tool: Open WPS Office and click on the 'PDF' tab from the home screen to access the PDF editor.
- 3. Open Your Document: Open your signed PDF document; WPS PDF will automatically process standard document signatures.
- 4. View Signature Status: Click on the signature panel to view the verification status and the detailed information of the signer.
Frequently Asked Questions
What does a 'certificate revocation error' mean in a PDF?
It means the PDF reader cannot confirm if the digital certificate used to sign the document is still valid. This usually happens when the software cannot reach the Certificate Authority's online revocation list (CRL) or OCSP server to check the certificate's current status.
Why does a certificate show as valid in Windows but invalid in Acrobat?
Adobe Acrobat often uses its own Adobe Approved Trust List (AATL) rather than the default Windows Certificate Store. This separate validation context can cause discrepancies if Acrobat cannot independently verify the chain online.
Can a firewall cause PDF signature validation errors?
Yes. If your network firewall or antivirus software blocks the PDF reader from reaching the specific OCSP or CRL servers required to check the certificate's status, the validation process will fail due to a lack of network access.
