20260409 / ssh gateways

For your information, incoming modifications:

• under NIS2 recommandations from ANSI (Agence Nationale de la Sécurité Informatique),
• under ruling by RSSI and ENSL Président

We are going to apply new security policies on ssh gateways (ssh.psmn and allo-psmn):

• enforcement of ssh key pair over password (login with password will not be allowed anymore),
• more constraining banning rules on aggressive ssh behavior (already applied on ssh.psmn since Oct 2025).

These modification will be applied before summer 2026.

See documentation on how to use ssh key pair, ssh-agent, etc: https://www.ens-lyon.fr/PSMN/Documentation/connection/ssh_keys_and_agent.html