Unwanted UTF-8 with BOM encoding even when using UTF-8 encoding

[BM671]

From our application txt file is getting generated with UTF-8 encoding but while uploading it to SFTP, the file got transformed to UTF-8 with BOM encoding. We are using below code to upload in SFTP and the version of Renci.SshNet that we are using is 2013.4.7.0.

List[AuthenticationMethod] methods;

methods = new List[AuthenticationMethod] { new PasswordAuthenticationMethod(username, password) };

var connectionInfo = new ConnectionInfo(host, port, username, methods.ToArray()); using (SftpClient sftpclient = new SftpClient(connectionInfo)) { sftpclient.Connect(); sftpclient.ChangeDirectory(destinationPath.Trim()); sourceFile.Position = 0; sftpclient.BufferSize = 8 * 1024; sftpclient.UploadFile(sourceFile, fileName); }

Please help to understand why we are facing this problem and what should be the possible fix. Thank you.

[Rob-Hague]

Are you able to reproduce the problem using the latest package version (2020.0.2)? The version you are using is over 10 years old 🙂

How are you creating the file? And validating that is does not have a BOM before the upload but does after? Note that System.Text.Encoding.UTF8 does provide a BOM (https://learn.microsoft.com/en-us/dotnet/api/system.text.encoding.utf8?view=net-7.0#remarks).

Are you able to reproduce the problem uploading the file with a different client e.g. WinSCP? Or to a different server?