Jenkins - Forbidden error 403 on private subnet EC2

Question

I'm learning devops and working on a project to install jenkins on an aws ec2 that is on a private subnet. Following the digital ocean doc, I was able to install it successfully and the jenkins service is running.

https://www.digitalocean.com/community/tutorials/how-to-install-jenkins-on-ubuntu-20-04

I have an ALB setup to access Jenkins, but the target group is failing with the health check 403.

When I try to curl on http://localhost:8080 on the same ec2 host or from the bastion host, I get an "Authentication required" error, and doing curl with -I gives me HTTP/1.1 403 Forbidden.

I've spent a lot of time trying to get help on Google, but nothing worked and I'm kinda stuck here.

Can someone please point me in the right direction?

Answer 1

Try using the /login instead.

curl -v http://localhost:8080/login