Unable to connect to Load balancer on port 443

Question

I have a Load balancer listening on port 443.  I am unable to telnet to the DNS name on port 443 from either the EC2 or my own IP at home.
The LB allows inbound connections from ALL IPV4 and IPV6 and allows for LB to EC2 host connectivity outbound to my EC2 instance (172.31.39.228)
The health check on my EC2 listener targets is also failing.  I am assuming that this is due to the VPC configuration.
I am NOT a networking expert as someone set up the VOC for me.  Any help is greatly appreciated
thx
Charlie DIDonato

I have a VPC with Network info below
public
subnet-925291ea	Available	vpc-5d3e4f25 | public sphof	172.31.16.0/20	–	4086	us-west-2a	usw2-az1	us-west-2	–	acl-32d41d49	Yes	Yes	No	-	No	064138676421
–
subnet-a3cb27e9	Available	vpc-5d3e4f25 | public sphof	172.31.32.0/20	–	4088	us-west-2b	usw2-az2	us-west-2	–	acl-32d41d49	Yes	Yes	No	-	No	064138676421
–
subnet-946a3fbf	Available	vpc-5d3e4f25 | public sphof	172.31.48.0/20	–	4091	us-west-2d	usw2-az4	us-west-2	–	acl-32d41d49	Yes	Yes	No	-	No	064138676421
–
subnet-e0b964bd	Available	vpc-5d3e4f25 | public sphof	172.31.0.0/20	–	4088 
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Riku_Kobayashi · Accepted Answer

Hello.

> The health check on my EC2 listener targets is also failing.

I think it is best to first make the ALB health check successful.  
Are you allowing ALB health check ports in your EC2 security group inbound rules?  
Also, is the web server running on EC2?  
Is it supposed to respond with HTTP status code 200 when accessing the document root of the web server?  
https://repost.aws/knowledge-center/elb-fix-failing-health-checks-alb

Are you using ACM or similar to set up SSL certificates in ALB?  
Also, do you have an A record set in ALB for your domain?  
https://docs.aws.amazon.com/acm/latest/userguide/gs-acm-request-public.html

Unable to connect to Load balancer on port 443

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