Files Truncated when uploaded by FTP

Files under 10K are truncated when uploaded by FTP. This issue was discovered by one of our customers and is caused by having Net Nanny on your computer. Unistalling Net Nanny resoved the issue. 

Background:
The customer complained that files were truncated when they were uploaded to his site using FTP regardless of whether FTP is done using Windows Explorer or using a 3rd party FTP software.

Cause:
Net Nanny was installed on the computer.

Resolution:
Uninstall Net Nanny. Turning Net Nanny off did not resolve the issue. It had to be uninstalled for FTP to work

Details provided by customer:

Just letting you know what was the issue so you have it available for anyone else experiencing a similar issue. I tried Pasv and Port FTP settings for both a FTP client, explorer, and msdos FTP but that did not fix the issue. I tried the FTP from another machine on my ISP router and it worked fine. Then I tried the FTP test from a virtual PC on the machine I was have a problem with and it also worked. So after turning off windows xp firewalls as well as my router's firewall, I was still experiencing this issue. I then updated my windows XP to sp3 but that did not fix the issue.

I then noticed this problem was only occurring for 10k file or smaller.

Anything over 10k transferred sucessfully.

Finally, I began looking at the Net Nanny product installed on the machine having an issue. First I shut off Net Nanny, but that did not fix the issue.

Then I proceeded to uninstall Net Nanny and bingo issue has been resolved. I no longer have problem with 426 Connection Closed; Transfer Abort". So even though Net Nanny was turned off it still apparently interfered with FTP file transfers that interestingly were small in file size. I am not sure if Net Nanny gets got between timing something since the files are small and transfer in a second.

Our thanks to Patrick for sending us the cause and resolution to this issue.