Endpoint for TCP port 1433 is not working

Hello-

I am trying to allow external inbound access to SQL running on a VM. I created an endpoint for TCP port 1433 but it does not connect. All required firewall exceptions and SQL configurations are set. Also- I AM able to connect if I set the public port on the endpoint to 14333 and map it to private port 1433 on the SQL box so I know that everything on the SQL VM is configured correctly. Any ideas on why a public endpoint port of 1433 doesn't work?

Thanks!

-Jeremy