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When I was trying euca-upload-bundle it was failing and giving this message.
S3ResponseError: 406 Not Acceptable
<Error xmlns="http://s3.amazonaws.com/doc/2006-03-01/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Code>NotReady</Code><Message>The service is not ready to accept your request</Message><Resource>walrus</Resource><RequestId>0225efd9-2397-41fd-973b-05dd80e7e874</RequestId></Error>
After trying a lot of things, I found that, sudo euca_conf --deregister-walrus and then sudo euca_conf --register-walrus xx.xx.xx.xx solved the problem.