Fixing the AWS Certification Exam OnVue Issue Before You Burn a Voucher
A passed system check is not a guarantee. Here are the real reasons OnVue fails for AWS Certification exams—and the exact fixes for launch, camera, and network failures.
The OnVue failure pattern
AWS certification candidates often clear the Pearson VUE system check only to hit a dead end when the exam should launch. The screen freezes on `Preparing your exam`, the webcam feed disappears, or the app reports that it cannot reach the delivery server. According to Pearson VUE’s OnVue requirements, you need a stable internet connection, a working webcam, and a quiet room; but those requirements do not cover every OS-level privacy control or network policy. These failures are usually not AWS-side; they are environmental.
The underlying problem is that OnVue is a locked-down browser session that requires continuous TCP/UDP connectivity, local media device control, and exclusive foreground process control. A normal laptop that is fine for Zoom is not automatically fine for OnVue.
Why the exam does not launch
1. The system check passes, but the exam never starts
The system check tests basic connectivity, microphone, and camera. It does not test the full WebSocket session, certificate inspection, or process exclusivity that OnVue enforces at launch. A passing check means the hardware was visible; it does not mean your browser profile or local security agent will allow the exam runtime to start.
Fix: close all browser windows, log into the Pearson VUE portal in a fresh profile, temporarily disable privacy extensions such as uBlock, Ghostery, or Brave Shields, and select the exam again. If using Safari, switch to Chrome or Microsoft Edge.
2. Corporate VPN or proxy blocks the proctoring session
OnVue needs a stable connection to Pearson VUE’s delivery endpoints. VPNs that force full-tunnel routing can block WebSocket upgrades, UDP streaming from the webcam, or the live chat connection to the proctor. Corporate proxies that do TLS inspection can also break the exam session.
Fix: if your organization allows, disconnect the VPN for the exam or configure split tunneling so that Pearson VUE delivery traffic bypasses the VPN. Avoid public Wi-Fi with captive portals. Use a wired or dedicated home connection.
3. macOS or Windows privacy settings block the camera
After OS updates, macOS may revoke camera, microphone, or screen recording permission for Chrome or Microsoft Edge. Windows Privacy settings can also reset for apps that use the webcam. OnVue cannot show the proctor a live feed if the browser cannot access the device.
Fix: On macOS, go to System Settings > Privacy & Security > Camera, Microphone, and Screen Recording, and ensure your exam browser is enabled. On Windows, go to Settings > Privacy > Camera and Microphone, and enable desktop app access. Then restart the browser and rerun the system check.
4. Background tools trigger the security termination
OnVue monitors for processes that can capture the screen, control the keyboard, or stream the desktop. Tools such as Microsoft Teams, Slack, Zoom, RDP, Parsec, virtual webcam software, AutoHotkey, and clipboard managers can cause the exam to refuse to launch or end suddenly.
Fix: quit these apps before the exam. On Windows, open Task Manager and stop any remote-control or screen-sharing process. On macOS, close menu bar utilities that request screen recording permission. Do not run the exam inside a virtual machine.
What to do before exam day
Create a separate local user account with administrator rights for the exam.
Use a personal laptop if your work device has mobile device management or security agents.
Disable automatic OS updates, scheduled antivirus scans, and sleep settings.
Run the system check at the same time of day, on the same network, in the same room.
What to do when the exam fails mid-session
1. Do not close the OnVue window unless it is completely unresponsive.
2. Use the chat or microphone to tell the proctor what changed: screen froze, camera drop, network disconnect.
3. Write down the incident number, timestamp, and exact error message.
4. Contact Pearson VUE support and open a case with AWS Training and Certification afterward.
A technical failure during check-in or delivery usually qualifies for a free reschedule or voucher extension. The key is to get the proctor to document the failure before you leave the session.