403 Forbidden error from cloudfront · Issue #2438 ...
https://github.com/pachyderm/pachyderm/issues/2438
Looking at the log timestamp, we can see that this is just barely timed out -- the log line was recorded ~766ms after the signature expires. So what is possible is that the request was sent just before the expiry time (22:17:03.99, say). If the client did a simple check at that point, the signature would still appear to be valid.
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