amazon ec2 - change keypairs ec2 running instance -

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hello i've made big mistake may key pairs on ec2 instance. can't connect sftp , putty because private key wrong.

how can access instances or change key pairs @ console?

i think need rebuild instance old(correct) key pair.

http://docs.amazonwebservices.com/awssecuritycredentials/1.0/aboutawscredentials.html#ec2keypairs


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