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Head's Up! Site migration is underway. Phase 2: migrate recent content

Sandbox in Cypher Fundamentals not working


I've been working through the Cypher Fundamentals training and for the last couple of days everything has been fine.  However, in the middle of a session I've lost the ability to connect to the Sandbox.  

I am connected to the sandbox Movie database outside of the course and I am able to make successful queries there.  The error message refers to a "websocket connection failure"  I've used Edge and Chrome both without success; I've logged out and in to my account and have terminated/restarted the movie DB and used my personal laptop as well as my work laptop, without success.

Chrome indicates the following error: 

"Access to fetch at '' from origin '' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled."

What are my options getting the sandbox working again?  If conf. files are involved, I may need some guidance as this is a new area for me.

Thanks in advance for any assistance offered.



One solution for this course is to terminate the Movies project in the site.

Then re-enter the course. It should automatically recreate the sandbox and you can resume where you left off.

Keep in mind that it takes a few minutes to create and populate the sandbox for the course.

Queries will only execute if there is the $neo4j prompt in the edit pane.

I've signed up to , refresh the course and everything works fine.