Using CFFILE with IE to Upload Larger Files

"Issue: Trying to use CFFILE with IE (5 and 5.5, other browsers not tested) to upload larger files (test file 4.2meg) over an internet connection. Files less than 1 meg worked fine, 4.2 meg file would almost instantly return a 'Page Not Found' error in IE when the 'Upload Now' button clicked.

"Why: As far as we can tell, IE doesn't seem to be able to handle browser based uploads of larger files when there is a proxy server involved 'at all.' If you have a direct connection to the internet you are fine. If you have a dialup connection to your ISP and you are not forced to their proxy, you are fine."

Example Given:

"I have a permanent dialup connection. I use my ISP's proxy for general browsing. If the proxy is set up in the Tools>Internet Options>LAN Settings, I'm stuffed when I try to use IE to upload the files to the site (despite the site being hosted at that ISP). I went into the advanced LAN settings and put the client's domain in the 'Exceptions' box and the CFFILE upload worked every time (no intervening proxy). I took the proxy setting off the connections settings completely and it worked perfectly (no intevening proxy).

"My client's workstation accesses the internet through a proxy server over a LAN through msproxy. Uploads from his workstation fail. Do the same thing from [the company's] server and it works (no proxy), BUT ONLY as long as my client's ISP doesn't force them to use a proxy at their end.

"I reported in my initial posts that I had success with Netscape in all circumstances. My success here may have been because I didn't have a proxy set up in [my Netscape] preferences, [but I'm] not sure. I'll let you know when/if I test it further. I'm going to wait till my hair grows back though ;-)"

Thank you, Craig. If anyone else has some more information on this bug, please email the editor at Fusion Authority (editor@fusionauthority.com).

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