We upgraded a Windows 2003 server to a Windows 2008 R2. After the conversion, we found out that if we click on a link to open a file (PDF or ZIP) and if we interrupted the download process. For example, I clicked a link to open a PDF file (about 3M) and when a PDF page was opened and I still saw that the rest of the file was downloaded, I clicked the Back button to go back to list of files. If I clicked the same link to open the same PDF file again, I would get an error saying that the file could not be opened. The same thing with clicking on a Zip file, after I clicked to save the file, if I closed the window showing that the file was being downloaded and I clicked to save the same file again, I would get an error. I could repeat this most of the time. It was harder with a small file because the file was downloaded completely and I was never saw the problem. It almost looked like when a file was not downloaded totally the first time and if I clicked to download again, the server thought that I should use the cache but the cache was not a complete file. If I set the option in IE to empty all the caches when IE is closed, I would be able to click on the link to the same file to download it again. Otherwise, I would not be able to download the file. Once in a while, I might get the error even though I did not click on a particular link before. I did the same test with our old Windows 2003 server and I did not the problem but I have no clue what to do. If anyone has any ideas, please let me know. RJ

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