Issues with 2016 Update 14 - Error after accessing ColdFusion Administrator using the connector port

Kevin, first, after applying the update, anyone using IIS or Apache with CF MUST (MUST MUST) upgrade the CF web server connector. I show how to do that here: 

https://www.carehart.org/blog/client/index.cfm/2019/11/13/when_how_update_cf_web_connector

That may be all you need.

But you refer to the CF Admin, and since CF2016, you cannot access the CF Admin using IIS or Apache by default, so when you say you are having trouble accessing the CF Admin, have you tried using the built-in web server port instead, like 8500? I could discuss how to find what port it listens on, but let's hear if the above gets you going.