CODEWITHSUNDEEP
amazon-web-servicesamazon-ec2aws-application-load-balancer
KarloSpacapan
KarloSpacapan

Reputation: 373

AWS application load balancer not forwarding requests

I have an application load balancer with a HTTP listener that should be invoking a Lambda.

Listener settings

However, there is no response when I make a request to the ALB's endpoint (This site can’t be reached).

There is no logs in Lambda's Cloudwatch from the requests I'm making, so it seems doesn't get invoked.

I also enabled Access Logs for ALB, however the bucket only contains one file (AWSLogs/ELBAccessLogTestFile) that was created when logging was enabled.

Additionally, I enabled health checks on the Target Group, and it's showing that the target Lambda is healthy. I can see the health check requests in Lambda's CloudWatch.

enter image description here

ACL allows all traffic:

ACL settings

There are 3 subnets associated with the ALB, they all use the same route table that does link to Internet Gateway:

Route table settings

So to me it looks like everything that's mentioned in the AWS troubleshooting for ALB is fine.

Other relevant settings:

enter image description here

Upvotes: 3

Views: 3648

Answers (1)

Oleksandr Khalin
Oleksandr Khalin

Reputation: 56

Failed to connect to <> port 80: Timed out

This message indicates that the curl can't connect to the ALB, not the ALB to lambda. Your ACL and route table look good. So I'd suggest checking a security group of the ALB. It must allow traffic on port 80 from at least your IP (or from specific CIDR depending on your requirements).

Upvotes: 3

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