File Chunking Fails When Served From IIS7 To Firefox

I have written a generic file serving handler in asp.net/vb.net..I recently moved to a windows 7 box and am now debugging under IIS7, and this is where the problems occure.Whenever I serve a file to either FireFox or Chrome (IE8 works fine) from IIS 7, the download will fail.

- In FireFox the error is "[some file name and path].part could not be saved, because the source file could not be read."

- In Chrome the error is "Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error."

- In IE8 it works fine

If I run the same code in IIS6, it works fine.If I run the same code in the Visual Studio virtual web server, it works fine (on windows 7 or XP).I am rather concerned about this as our production web server will soon be IIS7; which I'm starting to really love, and would hate to revert to IIS6 just because this won't work in IIS7.I've tried a number of different patterns.It seems to always fail on the Flush() line with the error "System. Web.HttpException = {"The remote host closed the connection. The error code is 0x8007 0040."}"One thing I have noticed, if I move the flush statment to the finally clause or remove it all together; firefox will attempt to read the entire file - it appears to be looping through the entire block of code just fine, until it hits the flush statement.If I remove the flush statment I still get an error and it still tries to read the entire file before asking me to save it.[code]