“host not allowed” error when deploying a play framework application to Amazon AWS EC2

[Hawk]

Hello,

I using Play 2.6.3. My App runs fine on dev mode and also on production mode on my local machine. However, after I deploy to EC2 ubuntu, and the app starts running fine. Everytime I call the app from my local machine I get the error 

Bad Request

For request 'GET /' [Host not allowed: ec2-xx-xxx-xx-xxx.compute-1.amazonaws.com:9000]

At the beginning, my application.conf in local enironment has the following 

play.filters {

  enabled = null

}

I had another configuration file on EC2 (in which I use the ec2 environment variables), and it is called 'prod.conf'. It had the same settings as the above.

I looked into similar posts here: https://stackoverflow.com/questions/45070168/host-not-allowed-error-when-deploying-a-play-framework-application-to-amazon-a

So I changed 'prod.conf' with the new settings:

play.filters {

  # Enabled filters are run automatically against Play.

  # CSRFFilter, AllowedHostFilters, and SecurityHeadersFilters are enabled by default.

  # enabled += filters.ExampleFilter

enabled += play.filters.hosts.AllowedHostsFilter

  # Disabled filters remove elements from the enabled list.

  # disabled += play.filters.hosts.AllowedHostsFilter

    hosts {

    # A list of valid hosts (e.g. "example.com") or suffixes of valid hosts (e.g. ".example.com")

    # Note that ".example.com" will match example.com and any subdomain of example.com, with or without a trailing dot.

    # "." matches all domains, and "" matches an empty or nonexistent host.

    allowed = [".", ""]

  }

}

I did not build and redeploy again (not sure if I need to). I just restarted the app with the update 'prod.conf' file. Unfortunately I am still getting the same 'bad request host not allowed' response. 

[Will Sargent]

That is the AllowedHostsFilter -- if you look at the logs and turn them up to DEBUG, it will tell you more.

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