AWS secure Cloudfront to ALB to Fargate communication - amazon-ec2

I have the following setup:
React.js App on Cloudfront (example.eu) -> Certificate for *.example.eu and example.eu
Fargate Python FastAPI instance on port 5000
Load Balancer internet facing http://***.eu-central-1.elb.amazonaws.com/
I can visit my website https://example.eu just fine
So in my front-end I defined the Load Balancer URL for doing the requests to the Fargate instance --> GET http://***.eu-central-1.elb.amazonaws.com/users.
I clicked on the button on the website to fire the request to the backend but I get a mixed content error in the browser.
Well, I thought let's do the calls over https - I added a HTTPS on 443 listener and added the certificate created earlier. And if I deactivate the SSL verification (e.g. in Postman) that works fine but else I get in my browser the following error:
VM11:1 GET https://***.eu-central-1.elb.amazonaws.com/users net::ERR_CERT_COMMON_NAME_INVALID
Do I need another certificate for the load balancer URL? I checked out a lot of tutorials and they only create one for the domain.
Do I need to add the certificate to my back-end?
I'm really confused how I can establish a proper https communication from example.eu over the load balancer https://***.eu-central-1.elb.amazonaws.com to my Fargate backend on port 5000.
Thanks

Found the solution:
Go to your Route 53 and add an A entry with Alias Target to the ALB.
Important: Add a subdomain in the name field: e.g. api.example.eu.
That's it :)

Related

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But I really want to make my health check for https pass.
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I have a website -- portaldevservices.com
The domain is managed by route 53 and works fine with http.
I have one ec2 instance.
I recently decided to move to https and put a load balancer in front of the ec2 instance.
From here I created a load balancer edited the A record and the Cname to the credentials of the load balancer. The health check is fine and the ec2 instance was added.
Using Amazon Certificate manager I created a cert and added it to the load balancer.
Here are some credentials/info:
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Website screenshot
hosted zones
load balancer port config
load balancer basic config
load balancer listener
acm certificate
Thanks for the help. I'm a mobile dev so this is my first time really stepping into the backend world.
Solved:
Ok that was a lot easier than I thought. If anyone else experiences this issue all I had to do was add the "www." to the front of my A type
From portaldevservices.com -> www.portaldevservices.com
The https access now works well.
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From portaldevservices.com -> www.portaldevservices.com
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