I have been using Railsplayground for a number of years to host a few RoR 
applications which use S3 to store confidential documents.  Due to the 
nature of the documents, I have been using S3's "authenticated_url" with a 
10 second timeout.  About a week ago my hosted apps stopped working, even 
though they continued to work properly from my development machine on 
localhost.  The problem was that the hosted server's clock was off by about 
10 seconds.  When I originally asked support if the clock was off, I was 
told (incorrectly) that it was correct.  Upon modifying my code to increase 
the timeout to 20 seconds, the apps returned to normal operation.  Once I 
gave that background info to their support people they actually went in and 
resynced the server's clock, so I was able to change the timeouts back to 
10 seconds.  The lesson... Confirm the accuracy of your server's clock if 
you use S3 with authenticated_url.

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