# Serve HTTP traffic on this port
set  :port, 4567
set  :host, "0.0.0.0"

# Serve HTTP traffic on this port
set  :port, 4567
set  :bind, "0.0.0.0"

Use the right option to specify the address to bind to
Use the right option to specify the address to bind to

See http://www.sinatrarb.com/configuration.html