About two weeks ago, our Video department started having trouble FTP'ing movie and 
flash files to the website (offsite).  At around that time we had a lightning strike 
that took out our T1 card, but this was replaced quickly.  We have a failover ISDN, 
but we cannot upload the files through that.  This is definitely not a firewall 
problem.

It only happens to those type of files. It only seems dependent on size when it is the 
movie files; flash files, regardless of size, won't upload at all. The transfer for 
movie files stalls at about 50%.  There is no filtering and we have had our T1 and 
router tested. The same files, zipped, run through just fine.  When we remove the *.rm 
and *.fla extensions, they still stall at the same place.

Our traffic runs at about 30% of the full T UNTIL we start to upload these types of 
files. Suddenly we run at 100% incoming--not outgoing--traffic.  

Sending the files from another location, or to another location, does not help.  
Trying it from different computers, using different FTP programs, does not help.

Can this be a DOS attack? Has anyone experienced this?

Thanks!
Laura Folden

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