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Asked: May 10, 20262026-05-10T20:42:04+00:00 2026-05-10T20:42:04+00:00

On large files (~200+ MB), I get the 503 error when I read the

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On large files (~200+ MB), I get the 503 error when I read the stream.

ftp = (FtpWebRequest)WebRequest.Create(new Uri(address.AbsoluteUri + @'/' + file.Name)); ftp.Credentials = new NetworkCredential(username, password); ftp.Method = WebRequestMethods.Ftp.DownloadFile;  response = (FtpWebResponse)ftp.GetResponse(); 

Any clues on what I’m doing wrong or a better practice for larger files?

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  1. 2026-05-10T20:42:05+00:00Added an answer on May 10, 2026 at 8:42 pm

    Do you receive the 503 after every attempt or only subsequent attempts?

    Have you tried setting the disabling KeepAlive?

    ftp.KeepAlive = false; 

    I would try a more rubust ftp client library, a basic free one can be at sourceforge.

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