Today morning i was facing an issue when opening graph academy and connecting the console on right side.
it gave me
the connection may be blocked by your firewall or proxy server. neo4j browser communicates with your sandbox through port 7687, so make sure your browser can communicate over this port.
I tried the sandbox link they gave me, but it went to gateway timeout.
The way I solved it was by going to actual sandbox website, and deleting the existing database and creating new one for movies.
after which graph academy started working.
If someone else is facing the same issue, this might help