This issue is caused by: Delay latency on the user's computer, or slow internet connection speed.
To solve this issue, please follow the below steps:
- Try clicking on the try again button on that same page. Noting that it's only necessary to click this button one time, clicking the button multiple times will not help.
- If the error persists, exit LockDown Browser and restart the computer.
- Shut down all other running applications on both the computer and the network, including other network devices.If using Wi-Fi, move as close to the router as possible.
- Lunch LockDown Browser again.
- If the error persists, try using a different network, or a hardwired connection via an Ethernet cable.