[NTLUG:Discuss] Strange ftp problems

[goodtimetribe]

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
>
>
>

-- 
Joshua K