I had an error message on my Portal page saying that "The Portal for ArcGIS licenses may be expired."
It was expired when I checked the keycodes file at C:\Program Files\ESRI\License10.6\sysgen
But why would it have a expiration date when the license says perpetual under My Esri account?
The problem is fixed after putting a new authorization code at the Portal for ArcGIS Level 2.
Does it mean I need to re-generate the code and re-authorize it every year even though the ArcGIS Enterprise license says perpetual?