ResumeNextDownload not working

Question

I am using resumenextdownload function but it is not working. It is starting from the offset but it again copy the entire bytes.

I have one file call abc which has 1500bytes so for the firsttime suppose it copies 1400bytes after resume it starts from 1401bytes and append the again 1500bytes by mean the total size of file is now 1400 + 1500 bytes.

I am getting the following error in log file.

FTPConnection.1 ---> REST 97011160
DEBUG [FTPControlSocket] 27 Oct 2016 20:26:16.867 : FTPConnection.1 500 'RE*T 97011160': command not understood.
DEBUG [FTPControlSocket] 27 Oct 2016 20:26:16.867 : FTPConnection.1 Expected reply codes = [350] (strict=False)
WARN [FTPClient] 27 Oct 2016 20:26:16.872 : FTPConnection.1 REST failed - resume will not be used ('RE*T 97011160': command not understood. (code=500))

 

Here 97011160 is offset byte.

Please help on this.

Answer 1

It looks like REST isn't supported on your server, so you won't be able to resume.

Comments

Some early version of IIS don't support it.  For others I think it might be an option.

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I am working on Windows Application without IIS.

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Whatever FTP server you are connecting to, it looks like it doesn't support resuming.

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Is there any function available within enterprisedt to check resume is being supported by server or not?

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No, unfortunately not. It's very rare that it isn't supported (perhaps it is disabled deliberately).

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As per our Server admin team our FTP hosted on IIS 7.0 server and there is no such restriction. Can you help is there anything specific setting which block resume support in IIS?

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There's another possibility. The server error is "'RE*T 97011160': command not understood."

I'm not sure why you are seeing RE*T instead of REST. That suggests to me that it might be that a firewall or router has modified the REST command before it gets to the server. The IIS logs will tell you if RE*T was received rather than REST (which is the legitimate command).