Issue with using the builtin Yorc in Alien4Cloud

[mubarkoot]

I installed alien4cloud default docker image on ubuntu 20.4, works very well.
I added the builtin plugin for Yorc orchestrator
However, when I configure Yorc orchestrator to the same ip of the server, it refuses to connect showing that java exception, connection refused.
I repeated this several times, don't exactly know where is the error.

Can anyone tell me if am missing any configuration. or what could be the problem.

Thank you heroes :)