Download request is dropped due to exceeding max content size.

For the past few days when I attempt to download SW up dates I get the following message: Download request is dropped due to exceeding max content size.
It pops up in a new IE window and is not limited to a single site (Java and Bell Canada so far).
My ISP is Cogeco and I get 15 Meg down with a 100 Gig cap and according to them I am not even close to hitting that.  I am running Vista.
Where is this restriction coming from?

Thanks
DaveForbesAsked:
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bazooka9265Connect With a Mentor Commented:
That was it! We have a Juniper SSG5 Firewall Router with AntiVirus scanning. I went into the Security-AntiVirus-Scan Manager settings. The "Exceeds Content Size Limit" was at the maximum setting of 10,000 KB. Since I couldn't increase it, I changed it from "Drop" to "Permit." Hit Apply, logged out and tested. Am no longer getting the error message we were both receiving. Hopefully this information will help in your situation as well. Please let me know.
Thanks!
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peter41Commented:
Have not you set some proxy server in your IE ?
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bazooka9265Commented:
I read somewhere that it may have something to do with antivirus scanning settings in a Juniper Firewall Router. I am having the same problem
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peter41Commented:
Such limit can be set on devices (or software firewalls which does virus scanning) due to HW limits of device and due to DoS attack protection. Imagine for example that 100 users downloads files and every file is about 20MB size. So there is need about 2GB memory on the device only due to virus scanning, because complete file first must be in device then follows scanning and then follows downloading to user's machine. If you disable size limit like you described, then one user can simply do DoS attack when it downads very large file (for example some DVD *.iso).
HW limitations are reason why you cannot enlarge file size.
Keep in mind this security issue.  Or set allowed large files only temporary or only for trusted users if possible.
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bazooka9265Commented:
Thank you for informing me about the security aspect of my disabling the maximun download file size setting on our firewall router. I did not see a way to permit trusted users to override the size limit.
I will temporarily disable it on a case by case basis only. Thanks again!
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