SSH fails after changing Amazon EC2 instance region

Question

When I created the EC2 instance, the default region was us-west. Then when the instance is running, I changed it to us-east, and the public DNS was also changed.

However, I SSH using the new DNS in putty, and it displays server refuses the key. If I switch back to us-west region, it shows the original DNS. Does anyone know why I cannot connect EC2 using us-east?

Answer 1

It sounds like the only way this could have happened is that if you created a similar instance in a new region. In which case your keypairs are different. You need to use the specific keypair for the region that you created it for.