Overview
This may or may not help with your issues with the authentication service.
Service
Firstly, if you are having issues with Smite authenticating your game for updates and what not, do the following.
Go To
Start Menu>Services.msc>Hi-Rez Studios Authenticate and Update Service>Start
Then start your game (launcher) in administrator.
This guide may or may not work, it is simply something i figured out that may help others.