Cannot remap port 8000 using Docker

[aaronhmiller]

$ docker run --name some-kaazing-gateway -h somehostname -e GATEWAY_OPTS="-Dgateway.hostname=somehostname -Xmx512m -Djava.security.egd=file:/dev/urandom" -d -p 8000:8000 kaazing-gateway

Works fine.

However, when attempting to remap 8000 to say 8050, it will fail. Any port other than 8000 will fail.

$ docker run --name some-kaazing-gateway -h somehostname -e GATEWAY_OPTS="-Dgateway.hostname=somehostname -Xmx512m -Djava.security.egd=file:/dev/urandom" -d -p 8050:8000 kaazing-gateway

Doesn't seem like the container is obeying the port remapping.