I have a front door set up for www.foo.com but I need it to be able to handle www.foo.com:5100 and a list of many other ports. Not sure how I can configure the front door to handle requests other than 80 and 443.
Currently this cannont be done. I was able to achieve this by using Azure Application Gateway. Much more configurable and has the same WAF capabilities. https://learn.microsoft.com/en-us/azure/application-gateway/