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What is causing jpeg image file corruption during upload to website

Last Modified: 2013-04-24
I've run into a problem that I've been unable to figure out.
I have a Dell Optiplex 755 running Windows XP Pro.
The Optiplex has a wired full duplex gigabit Ethernet connection to a Dell PowerConnect 2816.
The 2816 is connected to a Cisco RV 120W Wireless VPN Router.
That is connected to a Comcast IP Gateway.

If I try to upload a JPEG image file from the Optiplex to a business website, the JPEG file is corrupted.  The file size doesn't change, but the image is changed.  Never the same way.

Image file sizes range from 78K to 2.7M.

Transfers using filezilla in binary mode fail.
Files using Network Solutions upload screen also fail.

If I copy the same images to my netbook running Windows XP Home Edition.  Connect the netbook to a port on the PowerConnect, I can upload the files consistently and without corruption.

That would seem to indicate a problem with the Optiplex.

File transfers from the Optiplex to shared folders on other systems do not have problems.
Network statistics do not show an excessive number of anything.

I replaced the cable connecting the Optiplex to the PowerConnect.
I connected the Optiplex directly to the Cisco router.
Both did not change the results.  Uploads still failed.

I'm wondering if it's a flaky network interface on the Optiplex.
I've also wondered if it could be a flow control issue.  The gigabit transfer is going to bog down at the PowerConnect where it drops from 1 Gig to 100 Meg.
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