I received the following message, which is relevant to users logging in from outside the TU:
In accordance with our security policy the hpc clusters and servers will be placed behind a firewall. This means that a direct connection from the internet to your cluster or server will not be possible anymore after 8-Nov-2021. Access will still be possible from systems on the TU Delft campus or via an eduVPN connection. Alternatively a bastion host can be used. You can find information on how to connect from outside the campus on this wikipage:
Starting the 21st of October we will start notifying users who log in from outside the campus by showing a warning in the message of the day (the welcome screen that you see at every login) and by sending an email with an explanation including a link to the webpage mentioned above.