Yes, ec2 security groups allow you to specify which IP addresses can connect to a server and which ports they can connect to. That mechanism works fine if you know what your IP addresses are. The problem is with Scalr, you have to update your security groups every time you launch and/or terminate an instance. Unless you use a large pool of elastic IPs, you don't know which IP addresses to put on that list as they are constantly changing as your server demand goes up and down. Having a way to automatically register and deregister IP addresses of new servers would be really nice to have.
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