Web server is down Error Code 521

Yes, i'm using EC2 and i haven't stopped the instance or made any changes to it. The public ip on my ec2 instance and cloudflare match each other. Before this issue, i was setting up a cache plugin on my wp site and optimizing the images. Here's my public ip - https://15.228.234.124/ The website url - https://mrsocialdigital.com/

When I run the curl command, the following error occurs. From this, I suspect that a web server such as Apache is not running on EC2.

curl https://15.228.234.124/
curl: (7) Failed to connect to 15.228.234.124 port 443: Connection refused

curl http://15.228.234.124/
curl: (7) Failed to connect to 15.228.234.124 port 80: Connection refused

Connect to EC2 using SSH or Systems Manager Session Manager and check if the web server is running.

I tried connecting through SSH i get this error "server refused our key no supported authentication methods available server sent public key" I followed the instructions to connect to putty mentioned here - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/putty.html

I also tried connecting through Ec2 Instance Connect and i get this following error "Failed to connect to your instance Error establishing SSH connection to your instance. Try again later."

Should i try rebooting the instance?

Please also try connecting with the SSH client below. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/connect-linux-inst-ssh.html#connect-linux-inst-sshClient

ssh -i /path/key-pair-name.pem instance-user-name@instance-public-ip-address

If it still doesn't work, try restarting.