I encounter the same issue with both EditPad Pro and Webuilder2020. The server is CentOS 7 and I am using a non-root login. I am using SFTP connections because I encountered an issue with SCP although I can't remember what the issue was.
Here is the error:
I searched this forum and the Internet and found a couple of related articles but I'm still baffled.
I have no idea how to troubleshoot. Can someone walk me through the steps, please?
UPDATE: Now, I cannot connect to the server with that same account. I'm getting the same error message. I can however connect with root and different accounts.