Report that creates a Large CSV File

[tjohnson3050]

We have a Cognos series 7 (Impromptu) report we are trying to convert to Cognos 8.  The current report creates a large (~6GB) CSV file.  We are getting an error message when we try to run with options and save it to an external file system.  The report works fine with filtered data - a small csv file is created and saved out to the file system location we have specified.  When the report is unfiltered, it appears to complete (run history reports it ran complete), but the file is empty.

When we try to run the report interactively unfiltered, we get the following message:

Error Message:
CM-REQ-4276  The multipart request is invalid. A "Denial of Service" attack was detected.

Has anyone run into this issue before?