master: ssh: connect to host master port 22: Connection refused

i am trying to start my hadoop cluster using the command "start-dfs.sh" but am getting errors as shown below Starting namenodes on [master] master: ssh: connect to host master port 22: Connection refused Starting datanodes master: ssh: connect to host master port 22: Connection refused ive checked the ssh status, it then returns me: ssh.service - OpenBSD Secure Shell server Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enab Active: failed (Result: start-limit-hit) since Tue 2020-02-04 14:15:01 +04; 2 Process: 5017 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=255) Feb 04 14:15:00 hadoop-HP-Pro3500-Series systemd: ssh.service: Unit entered f Feb 04 14:15:00 hadoop-HP-Pro3500-Series systemd: ssh.service: Failed with re Feb 04 14:15:01 hadoop-HP-Pro3500-Series systemd: ssh.service: Service hold-o Feb 04 14:15:01 hadoop-HP-Pro3500-Series systemd: Stopped OpenBSD Secure Shel Feb 04 14:15:01 hadoop-HP-Pro3500-Series systemd: ssh.service: Start request Feb 04 14:15:01 hadoop-HP-Pro3500-Series systemd: Failed to start OpenBSD Sec Feb 04 14:15:01 hadoop-HP-Pro3500-Series systemd: ssh.service: Unit entered f how to fix this?