You try to launch the console and receive the following error:
The IIS application pools are not available.
It happens that the service account's (used during the on-premises installation) password change (e.g every 3 months policy).
When the service account's password change the application pool cannot be started.
To resolve the issue you need to change the password for each application pool, and then restart the IIS service, for example:
There are cases where you will need to add the service account to the Performance Log Users local group of the ControlUp Server On-Premises, in order for the service account to be able to start the application code.