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screenshot of error

I am setting up stratio admin, but it can't get ports. every time I am getting connection refused error. If you have experience what can be the reason, I'll be waiting your answers.

I have made FQDN s for master and slave computers. master: reslab1.ibsu.edu.ge slaves: reslab2.ibsu.edu.ge , reslab3.ibsu.edu.ge, reslab4.ibsu.edu.ge

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I have solved the problem. I didn't have installed SSH server. There are some steps also after instalation of ssh server, you have to change /etc/ssh/ssd_config file, add new ssh user. If anybody have the same problem you can find out the reason here https://help.ubuntu.com/community/SSH/OpenSSH/Configuring