SSH: succeed with XShell, but fail with ssh command

Question

I am using Windows 10. I need to SSH to another Windows server via FRP.

In XShell it was smooth. I set the FRP server IP and port, together with my username and password, and then I successfully logged in.

But when I try this with ssh command in Powershell, it's a failure.

I use this command (an example):

ssh my_username@1.2.3.4 -p 12345

it responds:

ssh: Could not resolve hostname my_username: \262\273\326\252\265\300\325\342\321\371\265\304\326\367\273\372\241\243

But my_username is not a hostname.

After this, it keeps responding about my_username even if I did not mention this.

For example, if I type:

ssh 1.2.3.4 -p 12345

It still says:

ssh: Could not resolve hostname my_user_name: \262\273\326\252\265\300\325\342\321\371\265\304\326\367\273\372\241\243

I tried this on a Windows 10 and a Windows 11 computer, but both are the same.

Answer 1

What is FRP?

Are you using ssh.exe from the Windows SSH Client feature?

This is Win11. SSH connects and I get prompted for the password.