Permission denied when sshclient.runcommand() using renci.sshnet

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After establishing an SSH connection, when trying to SCP some files from a remote server to another using Renci.SshNet library. The command is working perfectly when given directly to the terminal, but not through .NET

used this in terminal it works perfectly

~$ scp -i /private/key/file  /source/file user@connecting.com:/destination/file

What I have tried:

used this in .NET

SshClient.RunCommand("scp -i /private/key/file  /source/file user@connecting.com:/destination/file");

but this one throwing an error

Permission denied, please try again.
Permission denied, please try again.
user@connecting.com: Permission denied (publickey,password).
lost connection

I used ssh-add to authenticate the keypair automatically and it works fine through the terminal. But I couldn't figure out why it is not working with .NET (used Visual Studio 17.2.1). Please help me to figure this out.

Posted 31-May-22 1:57am

Arjun P

Updated 31-May-22 19:32pm

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k5054 · Answer 1 · 2022-05-31T05:35:00

Solution 1

Consider what SshClient.RunCommand() does. It runs the command string given on the remote system. This is the equivalent of typing

Shell

ssh user@remote scp -i /private/key/file /source/file user@connecting.com:/destinatin file

at the command line.

That's probably not what you're trying to do. What you probably want to look into is ScpClient Class[^] which can be used to copy a file from the local system to the remote system.

Posted 31-May-22 5:35am

k5054

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Arjun P 1-Jun-22 1:46am

Hi, thank you for your attention,
Actually, I need to SCP from one remote to another. So there is no need to SCP from or to the machine that I'm using. Is there any way I can make it?
The problem is only when I'm passing the command from .NET

k5054 1-Jun-22 9:00am

It looks like the remote scp command is trying to use password authentication. Are you sure you have the correct path for your /private/key/file, and that its the correct identity file for the remote host?
You could try turning off password authentication by adding -o PasswordAuthentication=false to your command line, You might also try adding -vv (yes, 2 v's) to get debug output to try to see why the remote scp is not working.