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    <p>After two weeks on a wild goose chase, I have not been able to find any combination of code changes that will allow this method of streaming PDF, Excel or Word documents when the '<i>Do not save encrypted pages to disk</i>' option is turned on.</p> <p>Microsoft has said this behavior is by design in a number of KB articles and private emails. It appears that when the '<i>Do not save encrypted pages to disk</i>' option is turned on that IE is behaving correctly and doing what it is told to do. <a href="http://ie7triage.spaces.live.com/blog/cns!3B6634EF5458F389!237.entry" rel="nofollow noreferrer">This post</a> is the best resource I have found so far that explains why this setting would be enabled and the Pros and Cons of enabling it:</p> <blockquote> <blockquote> <blockquote> <p>"The '<i>Do not save encrypted pages to disk</i>' comes into play when dealing with SSL (HTTPS) connections. Just like a web server can send done information about how to cache a file one can basically set Internet Explorer up to not save files to the cache during an SSL (HTTPS) connection regardless if the web server advises you can.</p> <p>What is the upside for turning this feature on, security is the number one reason why the feature is turned on. Pages are not stored in the Temporary Internet Files cache.</p> <p>What is the downside? Slow performance, since nothing is saved to the cache even that 1 byte gif image used a dozen times on the page must be fetched from the webserver each time. To make matters worse some user actions may fail such as downloaded files will be deleted and an error presented or opening PDF documents will fail to name a few scenarios."</p> </blockquote> </blockquote> </blockquote> <p>The best solution we can find at this point is to communicate to our clients and users that alternatives exist to using this setting:</p> <blockquote> <blockquote> <blockquote> <p>"Use 'Empty Temporary Internet Files folder when browser is closed'. Each time the browser closes all files will be purged from the cache assuming there is not a lock on a file from another instance of the browser or some external application.</p> <p>A lot of consideration needs to be given before utilizing '<i>Do not save encrypted pages to disk</i>'. Sounds like a great security feature and it is but the results of using this feature may cause your help desk calls to go up for download failures or slow performance."</p> </blockquote> </blockquote> </blockquote>
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