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An already allocated elastic IP can't be reassigned, also if an IP is allocated to you, you can validate the same under Elastic IP section under EC2 service. Try to resolve the EC2 public endpoint to validate that it is still being linked to your EC2.
answered 2 years ago
let me tell u my end again, so ip was already assigned to production server it just goes down unexpectadly without doing anything, then i just released that old ip which was already running fine and added new ip but main concern is why my old ip not running for service ?
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please clarify whether your production server goes down unexpectedly or your elastic IP loses network connectivity unexpectedly?. the workaround you found working, is by releasing the existing elastic IP and attaching a new elastic IP to the production server. you would like to know why swapping elastic IP resolves server connectivity issue. you can check if there is any exception to the Elastic IP basics covered here - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#eip-basics
so if i clarify myself, my production server unexpectedly were down i restarted many times but nothing worked , just by changing the ip what makes him working fine again