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Switched from HMAC-SHA1 to HMAC-SHA256 signature
While both are supported by AWS, the latter is stronger hash function. It is not believed to contain some security flaws identified in SHA-1. So sayeth Wikipedia - http://en.wikipedia.org/wiki/SHA-2 Ubuntu Enterprise Cloud (Eucalyptus) doesn't seem to allow requests using HMAC-SHA1. This is one of the changes I had to make to get amazon-ec2 gem working against my Eucalyptus cluster.
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