[NTLUG:Discuss] Strange ftp problems

[Michael Barnes]

Somehow, it is related to the file.  We had the problem again last night.
Out of six files uploaded, one file was corrupted.  The user opened the
file in her editor and resaved it then reuploaded it.  Same problem.  She
sent the file to us via email and also through You Send It.  Both files
were fine.  The operator here uploaded the file to the ftp site and it
became corrupted again.  These have all been uploaded using Filezilla, but
on different computers in different locations.  Very strange.

Michael


On Tue, May 14, 2013 at 9:10 PM, goodtimetribe <goodtimetribe at gmail.com>wrote:

> does the user have any defrag software running? Like maybe O&O running in
> the background or windows defrag or something? what about user file-system
> issues? fs level file encryption or compression? is there a proxy involved
> for the user? considered trying rsync? checked intensively for malware?
> many viruses / trojans involve backscattering random data or manipulating
> memory contents. it's possible the buffer could be compromised between the
> read process and the transmit process. there's a few different things that
> could be causing it. you've tried pretty hard on the server side, but i'm
> not really expecting the issue to be server side since you've  tried 3 and
> other users aren't impacted. I wouldnt mind knowing what fs on the server,
> normally recommending a journaling fs but as other users arent impacted, i
> still dont suspect server side for root cause.
>
>
>
> I've got an ftp server running vsftp.  I have almost 200 users with 8-10 GB
> > of uploads and 20-25 GB of downloads daily.  I have one folder that
> > periodically corrupts uploaded files.  These are all audio files,
> primarily
> > mp3 files.  When they get corrupted, they are still the same size and
> > length, and you can load them in an audio editor, but the segments are
> all
> > out of order.  You can play the file, but it just sounds like
> > gobbledegook.  We have had multiple users upload to this account with
> > different computers and different clients.  We have moved the ftp site to
> > three different servers so far.  It will happen with one or two files at
> a
> > time with other files from the same user going through just fine.  It's
> > like someone took an audio tape, cut it into pieces, then spliced it back
> > together out of sequence.  And it only happens with this one user account
> > on their specific folders.  All other users uploads and downloads are
> > fine.  It will be fine for a couple months, then start corrupting files
> > again for a week or so, then clear up.
> >
> > Has anyone run into such a thing or have any ideas where or what to look
> > for?  This is most perplexing.
> >
> > Thanks for any ideas,
> >
> > Michael
> >
>