ScenarioYou want to install the UserInterface on several machines.
QuestionWhat ports need to be opened in order to run the UserInterface?
AnswerYou don't need to open any ports to run the UserInterface (Java thick client).
The only ports being referenced in the UserInterface is the CP port of your Automation Engine so you can connect to it. This needs to be specified in the uc4config.xml file of the UserInterface.
Here is the documentation on it:
<connection name="V11U" system="V11U">
<cp ip="mydnsname" port="11501"/>