SFTP Slow Download and Upload speed

Hey,
as in the title no matter if I use FileZilla or WinSCP download and upload speed is slow. I'm using fiber 1Gb/s Upload is 300Mb/s. I disabled optimization buffer it did literally nothing...

Thanks in advance for helping me!

So does any client achieve better speeds?

I'm experiencing the same problem, when uploading files to the FTP server.

The server is a FileZilla server, running FTPS (Not SFTP), using explicit encryption and a self signed certificate.

The FileZilla FTP client can upload the about 600MB of files in 2 minutes and 20 seconds, but after 20 minutes the WinSCP client is still not done uploading.

During upload, the server is reporting multiple errors with the message: "Control channel closed with error from source 0. Reason: ECONNABORTED - Connection aborted". This message does not appear for every file, but it appears often enough to be noticed. When this problem occurs, the WinSCP client will recover from the error and try again, but this also adds a few seconds of delay, every time it happens.

The problem occurs when using the client directly or when using it through PowerShell or in a C# application.

@MrAndersen: So do you believe the slow transfer is due to the reconnects only? Or it's just a part of the problem?

@martin: No the slow transfer occurs even when there is no reconnect.

Please post logs both from WinSCP and FileZilla.

martin wrote:

So does any client achieve better speeds?

Right now my speed increased to MAX 6MB/s

So here is the log file

@Prawy: Please give us information about speeds you achieve in other clients using the same protocol. And post equivalent logs both from WinSCP and that client.

Other client you mean for example FileZilla?

@Prawy: Yes.

Here are the logs well on FileZilla I was having like 25MB/s speed.

Thanks. Though can you please increase verbosity of the FileZilla log? With your current settings, the log does not show anything useful.

Also I see that you have turned on a compression in WinSCP. What are the results with the compression turned OFF?

While transferring in WinSCP, is any of the CPU cores maxed?