I got the same Problem.
I can't log in on my Laptop at my home, since the update at 14.5.
To get the update, I went to a friends house to copy, paste the game data an startet the game at his home on my own Laptop with his game data.
Everything worked.
So I went home again to log in at my home, but I had the same Problem as before.
I restartet the router and tryed it again with the same result
"The Server is undergoing inspection or updates. Connect to
[Only registered and activated users can see links. Click Here To Register...] for more Information."
I tried to get in Contact with the Support, but I can't find a button or something like this at the Homepage. Am I blind?
Where can I find it?