# Applied Graph Algorithms \> Category Hierarchy \> ebSocket connection failure

**URL:** <https://community.neo4j.com/t/applied-graph-algorithms-category-hierarchy-ebsocket-connection-failure/16423>\
**Category:** Graph Academy\
**Created:** [March 30, 2020, 3:49am UTC](https://community.neo4j.com/t/applied-graph-algorithms-category-hierarchy-ebsocket-connection-failure/16423 "2020-03-30T03:49:56Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![AdrienLemaire](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/adrienlemaire/32/10217_2.png) [@AdrienLemaire](https://community.neo4j.com/u/AdrienLemaire)\
**Post date:** [March 31, 2020, 11:21pm UTC](https://community.neo4j.com/t/applied-graph-algorithms-category-hierarchy-ebsocket-connection-failure/16423/8 "2020-03-31T23:21:01Z")

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Thank you @lyonwj.  
Indeed, I was using the Bolt URL instead of the websocket one, can't believe I made such a blunder.  
Sorry for the disturb, and thanks for the great support!

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