Commented Issue: SshAuthenticationException : User cannot be authenticated [1547]

Getting SshAuthenticationException : User cannot be authenticated when trying to authenticate with username/password+private key(dsa, 2048bits w/o passphrase)

```
var connectionInfo = new ConnectionInfo(host, 22, username, new PasswordAuthenticationMethod(username, password),
new PrivateKeyAuthenticationMethod(username, new PrivateKeyFile(File.OpenRead(key_path))));

using (var sftp = new SftpClient(connectionInfo))
{
sftp.Connect();
```
Comments: ** Comment from web user: olegkap **

Hey,

Thanks for reporting it and providing a fix.

I couldn't test that situation cause I don't have a server to test against.

I just committed your provided fix.

Thanks,
Oleg