Get your questions answered from our list of frequently asked questions.
The problem is usually caused by a proxy server or firewall that interrupts the communication between the content and the authentication server.
To resolve this issue, ask your IT department to whitelist the domain on port 443 (https). The domain may differ for different users so be sure to check which domain the content is delivered from, however, it may be one of these:
Why do proxy servers or firewalls block the content?
Proxy servers and firewalls are designed to protect your organization from unwanted viruses, malware and other phishing type schemes. However, some types of communication is safe, such as the content you're trying to access as this is coming from a legitimate and trusted source.
How do I make these changes?
You need to speak to your IT admin as they'll know what to do but here are some quick tips:
How can I check for a proxy server:
What error message does the user see in Adobe Reader or Acrobat?
They would see a pop-up message like this: