What is the difference between HFS and for example EFS in a specific situation
Never heard of EFS till now? So...no clue. However, both being webservers
some basic functionalities have to be the same.
Are you trying to connect to HFS on a port other than 80 from work?
Some enterprise networks block use of ports in address.
Mine does, wont allow the :8080, or even :80, etc on the end of the address.
I assume you have both servers set to and forwarded to different ports
(if you are running both at once)?