Curriculum is not loading

curriculum page is not working in any browser on pc or mobile. But remaining pages like forum settings are working well. It shows the following message in chrome
This site can’t be reached
The connection was reset.

Checking the connection
Checking the proxy and the firewall
Running Windows Network Diagnostics
this curriculum was not working in ay other browser also.

12 posts were merged into an existing topic: Not able to access the curriculum