[NTLUG:Discuss] Strange ftp problems

[Kenneth Loafman]

Try using a different FTP client?  You mentioned they were all uploaded
with Filezilla.  I've had good luck with it, but that seems to be a common
point of failure in this case.

...Ken


On Wed, May 15, 2013 at 10:25 AM, Michael Barnes <barnmichael at gmail.com>wrote:

> 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
> > >
> >
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