Fix AATL and EUTL Update Button Not Working in Adobe Acrobat
Question details
The user is unable to update the AATL and EUTL trusted certificate lists, which leads to digital signatures showing as invalid.
- Product
- Adobe Acrobat / Reader DC
- Device & OS
- Windows 10
- Scenario
- Attempting to update trusted certificates for digital signatures via the Acrobat Trust Manager.
- Observed behavior
- Clicking the 'Update Now' button fails to download the lists, often returning the error 'An update for trusted certificates is not available for download'.
Ensure your computer has an active internet connection and that your network administrator has not restricted access to Adobe's update servers.
Verify Network, Firewall, and Proxy Settings
Check if network restrictions are blocking Acrobat from downloading the certificate updates from Adobe servers.
The 'Update Now' feature requires a direct connection to Adobe's servers. Firewalls, proxies, or strict security software can internet this download, prompting the error that updates are unavailable.
Open your Windows Settings, go to 'Network & Internet', and verify that your system is connected to the internet without restricted access.
Open Windows Defender Firewall or your third-party antivirus software. Check the outbound rules to ensure Adobe Acrobat or Reader DC is allowed to communicate through the firewall.
If you are using a corporate network, contact your IT department to confirm that web traffic to Adobe's certificate trust list servers is not being blocked by a network proxy.
Configure Adobe Acrobat Trust Manager
Ensure that Acrobat is properly configured to request trusted certificates from Adobe AATL and EUTL servers.
Try WPS Office for Seamless PDF Management and Signatures
If Adobe Acrobat continues to experience connection or update issues, consider switching to WPS Office. WPS Office is a lightweight, fully-featured, and free alternative that supports PDF viewing, editing, and reliable digital signature management without heavy network dependencies.
- 1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite.
- 2. Open your PDF: Launch WPS Office and open your PDF document directly in the built-in WPS PDF tool.
- 3. Manage signatures: Navigate to the 'Protect' or 'Fill & Sign' tab to easily manage, validate, and apply your digital signatures.
Frequently Asked Questions
What is the Adobe Approved Trust List (AATL)?
AATL is a program that allows users globally to create digital signatures that are trusted automatically whenever the signed document is opened in Adobe Acrobat or Reader, provided the certificate list is up to date.
Why do digital signatures say 'invalid' in my PDF reader?
Digital signatures appear invalid if the certificate used to sign the document is not recognized by your software's trust list. Updating the AATL and EUTL lists usually resolves this by fetching the latest trusted certificates.
Can reinstalling Acrobat fix the Trust Manager update error?
Reinstalling Acrobat using the Adobe Cleaner Tool often does not resolve network or service connection issues, which are the most common causes of the certificate lists failing to download.
