Troubleshooting - PDF Signatures showing as Invalid

Dec 9, 2024

Troubleshooting - PDF Signatures showing as Invalid

Introduction

This article will provide you with guidelines on how to troubleshoot Invalid PDF Signatures. If this is not the solution you are looking for, please search for the solution in the search bar above.

Troubleshooting Guidelines

Invalid PDF Signatures could be caused by either of the following reasons listed below: 

1. Expired Cross Certificate 
   
   To remove the expired Cross Certificate, follow the guidelines found here:
   https://support.globalsign.com/ssl/ssl-certificates-installation/how-remove-expired-cross-certificate-your-token
2. Outdated AATL (Adobe Approved Trust List) in Adobe Acrobat Reader
   
   To manually update the AATL (Adobe Approved Trust List) in Adobe Acrobat Reader, follow the guidelines found here: ​​​​​​https://support.globalsign.com/aatl-document/how-manually-update-adobe-approved-trust-list-aatl-adobe-acrobat-reader