EC2 prompts 1 status check failed, elastic IP has been unlinked and released

Question

Today I found that the website built on EC2 cannot be accessed. When I logged into the control backend, I found that EC2 prompted one status check that did not pass.The server is EC2 Seoul。
I couldn't handle it independently, so I stopped the server and restarted it. But the website still cannot be accessed normally.
I started checking the settings of EC2 and found that the elastic IP is not the IP associated with me. An unfamiliar IP has appeared and the bill indicates that it has been idle for more than 188 hours!
But when I introduced the website to the client three days ago, I confirmed that it could be accessed normally.
The idle cost is less than $1, I can fully afford it. But I want to know, why did this malfunction occur?
Will it happen again in the future? I can't tolerate this kind of website malfunction continuously!

learn2skills · Answer

Hello @joyver

If you receive a prompt that an EC2 status check failed and an Elastic IP has been unlinked and released, you can try these steps to troubleshoot: 
**Check the instance's status check metrics**
See if the instance status check or system status check failed. 
**Check the instance's system logs**
If the instance status check failed, check the system logs to see what caused the failure. 
**Check for a Kernel Panic error**
If the system log contains a Kernel Panic error message, the kernel might not have the vmlinuz or initramfs files. These files are required to boot successfully. 
**Stop and start the instance**
If a system status check failure indicates a problem with the AWS systems, you can stop and start the instance to migrate to a different underlying host. 
**You can also release an Elastic IP address by following these steps:**
1. Open the Amazon EC2 console
2. Select Elastic IPs in the navigation pane
3. Select the Elastic IP address to release
4. Choose Actions, then Release Elastic IP addresses
5. Select Release

An Elastic IP address is a static IPv4 address that is allocated to an AWS account. It can be used to mask an instance or software failure by remapping the address to another instance in the account.

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EC2 prompts 1 status check failed, elastic IP has been unlinked and released

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