ec2-plugin currently assumes that the AWS URL will be of the format "ec2.(region).amazonaws.com," but there are cases (such as C2S) where the URL will end with something other than amazonaws.com. It would be useful if AmazonEC2Cloud.java were modified to make that a configurable value, defaulting to amazonaws.com. Currently, the EC2 code does not work at all in these situations; the regions never get listed and attempts to launch instances fail to execute.

Also, found while looking at this - it appears that getS3EndpointURL has the URL order wrong; it does (region).s3 instead of s3.(region).