Timeout after login in Private MWAA behind ALB with Custom Domain

Question

I'm provisioning a private MWAA and setting a public access through ALB (with ACM and custom domain ), following [this documentation](https://docs.aws.amazon.com/mwaa/latest/userguide/vpc-vpe-access.html#vpc-vpe-access-load-balancer).

Domain and certificate are working, SSO login works, but redirect after login sends browser to private URL (which causes a timeout error). The only information I can find is [this one](https://repost.aws/questions/QU-inYMakLQmGJo-M6IhGkZA) but the link to another answer is broken

I also checked the Airflow documentation. . There is a key called 
[webserver.base_url](https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#base-url) but it doesn't seem to work. The URL at the login screen looks fine: `https://my-custom-domain/aws_mwaa/aws-console-sso?next=https%3A%2F%2my-custom-domain%2Fhome`

Answer

Could you please validate the 1) target group's (Registered Targets [1])which are attached to the ALb and also the security groups attached to the ALB ? "If this does not work, please open open a support case with AWS using the following https://console.aws.amazon.com/support/home#/case/create "? We can debug the issue and raise a request with Service team if needed.

[1] https://aws.amazon.com/blogs/aws/new-application-load-balancing-via-ip-address-to-aws-on-premises-resources/

Timeout after login in Private MWAA behind ALB with Custom Domain

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