Unable to access Sinatra app on host machine with Vagrant forwarded ports

After starting my Sinatra application with both ruby app.rb and foreman start I am unable to access my application with localhost and the respective port on my host machine. I am also able to curl to the applications from within the shell of on guest machine, whereas on the host machine the curl request fails. As far as I know there shouldn't be a firewall in place on the guest machine because I'm

[tvsk]

起動時に "bundle exec ruby app.rb -e production" で行けた。単にポートフォワードできていなかった可能性もあり