So I have figured out what to do. Instead of using a private key to connect to the server. It is better to use openSSH server and SSH. This worked for me and it is way more better than using a private key. You can see the following tutorial to install and connect to the server using SFTP.
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所以我已经弄清楚该怎么办。
而不是使用私钥连接到服务器。最好使用OpenSSH服务器和SSH。
这对我有用，比使用私钥要好得多。
您可以看到以下教程，使用SFTP安装并连接到服务器。
教程
我应该提及的一些事情
有关更多帮助，您可以随时回复此评论。
So I have figured out what to do.
Instead of using a private key to connect to the server. It is better to use openSSH server and SSH.
This worked for me and it is way more better than using a private key.
You can see the following tutorial to install and connect to the server using SFTP.
The Tutorial
Some things I should mention are:
For more help you can always reply to this comment.