martin wrote:

One possible workaround is doing something like GetFiles("/.ignor[e]", "xxx") - As the parameter is file mask (although it can match a single file only), WinSCP should use MLSD or LIST (to retrieve list of files) instead of MLST (to retrieve attributes of the specific file).

Thanks very much!

Use your method GetFiles("/[.]ignore", "xxx"), I solve this problem.

Post a log file from WinSCP GUI showing download of those files.

It's possible that the server returns dot-files in MLSD or LIST response, but fails MLST command for them. That's imo a (server's) bug.

Why do you even call GetFiles explicitly for that single file?

One possible workaround is doing something like GetFiles("/.ignor[e]", "xxx") - As the parameter is file mask (although it can match a single file only), WinSCP should use MLSD or LIST (to retrieve list of files) instead of MLST (to retrieve attributes of the specific file).

martin wrote:

Can you download that file using any FTP client at all?

Yes, I can download the '.ignore' file with FileZilla or WinSCP Client.
But could not download in C# with WinSCP .Net assembly.

Can you download that file using any FTP client at all?

When I use "WinSCP .NET Assembly" to GetFiles("/.ignore", "xxx") from Serv-U server.

I found before RETR /.ignore the MLST /.ignore will excute, then Serv-U server return "550 No files found", the winscp throw a "SessionRemoteException: Can't get attributes of file '/.ignore'" error, download fail.

How to user WinSCP .NET Assembly to download dot files from serv-u?

Thanks very much!