<\/span><\/h2>\n\n\n\nInstead of running AWS CLI commands from your local machine or launching a temporary EC2 instance, the easiest and most secure option is to use AWS CloudShell<\/strong>.<\/p>\n\n\n\nCloudShell is a browser-based shell provided by AWS, which comes pre-installed with AWS CLI and is already authenticated with your user\u2019s IAM permissions.<\/p>\n\n\n\n<\/span>How to Access CloudShell<\/span><\/h3>\n\n\n\n\nLog in to your AWS Console.<\/li>\n\n\n\n On the top-right corner of the dashboard, click the \u201cCloudShell\u201d<\/strong> icon.<\/li>\n\n\n\nA terminal window will open at the bottom of your screen. This is a fully managed shell environment with access to AWS CLI.<\/li>\n\n\n\n Ensure that the IAM user or role you’re logged in with has the necessary permissions to modify security groups<\/strong>, such as ec2:AuthorizeSecurityGroupIngress<\/code>.<\/li>\n<\/ol>\n\n\n\nNow you’re ready to run shell scripts directly in AWS without any local setup.<\/p>\n\n\n\n
<\/span>Step 3: Add Cloudflare IPv4 to Security Group Using AWS CLI<\/span><\/h2>\n\n\n\nOnce CloudShell is open, you can execute the following shell script to whitelist Cloudflare\u2019s IPv4<\/strong> address ranges.<\/p>\n\n\n\nReplace sg-08ea2ffd64093123c<\/code> with the ID of the security group you created earlier.<\/p>\n\n\n\n#!\/bin\/bash\n\n# Download Cloudflare IPv4 address ranges\nwget https:\/\/www.cloudflare.com\/ips-v4 -O cloudflare_ips.txt\n\n# Security Group ID\nSG_ID=\"sg-08ea2ffd64093123c\"\n\n# Loop through each IPv4 range and allow ports 80 and 443\nwhile read -r p || [[ -n \"$p\" ]]; do\n aws ec2 authorize-security-group-ingress \\\n --group-id \"$SG_ID\" \\\n --ip-permissions \"IpProtocol=tcp,FromPort=80,ToPort=80,IpRanges=[{CidrIp=$p,Description='Cloudflare'}]\"\n\n aws ec2 authorize-security-group-ingress \\\n --group-id \"$SG_ID\" \\\n --ip-permissions \"IpProtocol=tcp,FromPort=443,ToPort=443,IpRanges=[{CidrIp=$p,Description='Cloudflare'}]\"\ndone < cloudflare_ips.txt\n\n# Cleanup\nrm cloudflare_ips.txt\n\necho \"Cloudflare IPv4 IPs have been added to the security group.\"\n<\/code><\/pre>\n\n\n\nHow to run the script in CloudShell:<\/strong><\/p>\n\n\n\n\nCopy the script above into a file:<\/li>\n<\/ol>\n\n\n\nnano add-cloudflare-ipv4.sh\n<\/code><\/pre>\n\n\n\n\nPaste the content, save (Ctrl + O<\/code>), and exit (Ctrl + X<\/code>).<\/li>\n\n\n\nMake it executable and run:<\/li>\n<\/ol>\n\n\n\nchmod +x add-cloudflare-ipv4.sh\n.\/add-cloudflare-ipv4.sh\n<\/code><\/pre>\n\n\n\n<\/span>Step 4: Add Cloudflare IPv6 to Security Group Using AWS CLI<\/span><\/h2>\n\n\n\nIf your setup supports IPv6, run the following script the same way to allow Cloudflare’s IPv6 ranges:<\/p>\n\n\n\n
#!\/bin\/bash\n\n# Download Cloudflare IPv6 address ranges\nwget https:\/\/www.cloudflare.com\/ips-v6 -O cloudflare_ips.txt\n\n# Security Group ID\nSG_ID=\"sg-08ea2ffd64093123c\"\n\n# Loop through each IPv6 range and allow ports 80 and 443\nwhile read -r p || [[ -n \"$p\" ]]; do\n aws ec2 authorize-security-group-ingress \\\n --group-id \"$SG_ID\" \\\n --ip-permissions \"IpProtocol=tcp,FromPort=80,ToPort=80,Ipv6Ranges=[{CidrIpv6=$p,Description='Cloudflare'}]\"\n\n aws ec2 authorize-security-group-ingress \\\n --group-id \"$SG_ID\" \\\n --ip-permissions \"IpProtocol=tcp,FromPort=443,ToPort=443,Ipv6Ranges=[{CidrIpv6=$p,Description='Cloudflare'}]\"\ndone < cloudflare_ips.txt\n\n# Cleanup\nrm cloudflare_ips.txt\n\necho \"Cloudflare IPv6 IPs have been added to the security group.\"\n<\/code><\/pre>\n\n\n\nRun the same steps: create a .sh<\/code> file in CloudShell, make it executable, and execute it.<\/p>\n\n\n\nThis ensures that your EC2 instance accepts traffic only from Cloudflare\u2019s networks, protecting it from direct IP hits.<\/p>\n\n\n\n
<\/span>Step 5: Attach the Security Group to Your EC2 Instance and Remove the Default One<\/span><\/h2>\n\n\n\nNow that your security group is configured to allow only Cloudflare traffic, it\u2019s time to attach it to your EC2 instance and detach the default security group (which often allows unrestricted access like 0.0.0.0\/0).<\/p>\n\n\n\n
<\/span>Steps to Attach the Security Group:<\/span><\/h3>\n\n\n\n\nGo to the EC2 Dashboard<\/strong> in the AWS Console.<\/li>\n\n\n\nClick on Instances<\/strong> from the left sidebar.<\/li>\n\n\n\nSelect the EC2 instance you want to secure.<\/li>\n\n\n\n In the bottom panel, click on the Security<\/strong> tab.<\/li>\n\n\n\nNext to \u201cSecurity groups\u201d, click the edit icon<\/strong>.<\/li>\n\n\n\nIn the edit screen:\n\nRemove<\/strong> the default security group (if it allows 0.0.0.0\/0 or wide access).<\/li>\n\n\n\nAdd<\/strong> the new security group you created for Cloudflare IPs.<\/li>\n<\/ul>\n<\/li>\n\n\n\nClick Save<\/strong> to apply changes.<\/li>\n<\/ol>\n\n\n\nThis way, only Cloudflare\u2019s network can reach your server over HTTP (port 80) and HTTPS (port 443), preventing any direct IP access attempts.<\/p>\n\n\n\n
<\/span>Step 6: Verify That Your EC2 Instance Is Now Protected from Direct IP Access<\/span><\/h2>\n\n\n\nAfter applying your new security group, it\u2019s essential to verify that everything is working correctly \u2014 meaning your EC2 instance is only accessible through Cloudflare and not via direct IP<\/strong>.<\/p>\n\n\n\n<\/span>1. Confirm Your Website Loads via Domain Name<\/span><\/h3>\n\n\n\nVisit your website through the domain name (e.g., https:\/\/yourdomain.com<\/code>). If everything is set up properly, your site should load normally.<\/p>\n\n\n\nYou can also inspect the response headers in your browser’s developer tools (Network tab). If you see headers like cf-ray<\/code> or server: cloudflare<\/code>, it confirms your site is successfully routed through Cloudflare.<\/p>\n\n\n\n<\/span>2. Try Accessing Directly via Public IP (It Should Fail)<\/span><\/h3>\n\n\n\nNow, try entering your EC2 instance\u2019s public IP directly in your browser:<\/p>\n\n\n\n
http://<your-ec2-ip><\/code><\/pre>\n\n\n\nYou should get a timeout or connection refused message. That\u2019s perfect \u2014 it means your server is no longer accepting direct traffic and is only accessible through Cloudflare.<\/p>\n\n\n\n
For more detailed verification, you can run:<\/p>\n\n\n\n
curl http:\/\/<your-ec2-public-ip><\/code><\/pre>\n\n\n\nAnd then:<\/p>\n\n\n\n
curl -I https:\/\/yourdomain.com<\/code><\/pre>\n\n\n\nThis will show if the response is coming through Cloudflare (look for server: cloudflare<\/code>).<\/p>\n\n\n\n<\/span>3. Double-Check Security Group Rules<\/span><\/h3>\n\n\n\nGo to EC2 > Security Groups<\/strong>, click on your custom security group, and confirm:<\/p>\n\n\n\n\nOnly Cloudflare IPs are listed in the Inbound rules<\/strong><\/li>\n\n\n\nPorts 80 and 443 are included<\/li>\n\n\n\n No open access like 0.0.0.0\/0<\/code> or ::\/0<\/code> is present<\/li>\n<\/ul>\n\n\n\n<\/span>\u26a0\ufe0f Important Note About File Uploads & DNS Proxy Mode<\/span><\/h2>\n\n\n\nPlease note: When using Cloudflare with the proxy mode enabled<\/strong> (orange cloud icon in DNS settings), your website’s traffic is strictly routed through Cloudflare. That\u2019s the whole point of this setup.<\/p>\n\n\n\nHowever, there is a 100 MB upload limit<\/strong> on Cloudflare\u2019s proxy.<\/p>\n\n\n\nSo if you need to upload files larger than 100 MB (such as large backups or videos), you may face issues \u2014 uploads can fail or timeout.<\/p>\n\n\n\n
To handle this, you can temporarily:<\/p>\n\n\n\n
\nDisable Cloudflare proxy for your domain (turn the orange cloud to gray).<\/li>\n\n\n\n Add back the default security group<\/strong> that allows open access (e.g., 0.0.0.0\/0) just for that time.<\/li>\n\n\n\nComplete the upload.<\/li>\n\n\n\n Re-enable the Cloudflare proxy.<\/li>\n\n\n\n Re-attach the Cloudflare-only security group and remove the open one.<\/li>\n<\/ol>\n\n\n\nThis ensures you stay secure and functional, without permanently exposing your EC2 instance.<\/p>\n","protected":false},"excerpt":{"rendered":"
When you use Cloudflare to protect your website or application, it acts as a reverse proxy. All user traffic passes through Cloudflare before reaching your AWS EC2 instance. This setup protects your origin server from threats like DDoS attacks, malicious bots, and direct IP scanning. However, if your EC2 instance accepts connections from all IPs, …<\/p>\n","protected":false},"author":2,"featured_media":13284,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[971],"tags":[],"class_list":["post-13279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security"],"yoast_head":"\n
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