筆者在使用ssh localhost時出現Connection refused提示，初步判斷是22埠未開啟服務，也有可能是防火牆未正確配置。
測試
使用netstat | grep 22測試，發現22埠並沒有程式，很顯然應該安裝ssh服務端。
本機安裝有ssh客戶端並不代表安裝有服務端
需要安裝openssh-server
Ubuntu
sudo apt install openssh-serverSSH出現Connection refused錯誤
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