After upgrading to 15.2 I was having problems getting connected locally to the AC.

Did all the usual steps: cleared Java, updated Java, redownloaded launcher from UDI, redownloaded local Admin from Eisy.

But it would not connect, even after following Mac OS's new Security process for opening downloaded java files --> After trying to open the file, Mac will ask you to move it to the trash or cancel. Instead, go to system settings, Privacy and security and scroll down. After attempting to open it, you will see the file named and the option to open it. Click here and you will again get a warning dialogue that you can click thru to open

Finally went to Java control panel under system settings and under the Temporary Internet Files / View, a new box opens up. Here I double clicked on IoX Launcher and I received a new Mac dialogue box asking if I want to give permission for local access. Clicked Yes, and all is working again. 

FYI for anyone else struggling as this may help. 

This information was very helpful!