Having followed the instructions and prerequisites, we cannot get the websites on our fresh install of ARS 7.3.1 to work. We have matched our install to an existing install that works. We have the correct .NET Framework and copied all of the settings from the working server. After hitting the ARWebSelfService or ARWebAdmin portal address, The Application Pool stops after five 5009 errors in the Microsoft system log, and the web session returns Http error 503. What is strange is that even when the Application Pool is running, there is no Worker Process running in IIS (vs8.5).
Thanks and have a great day!