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Announcement: Blocking of the SSH protocol on the IDS/IPS from 05.08.2025
As part of the IT security strategy of the University of Kassel, external access via Secure Shell Protocol (SSH) to the entire university network will be blocked by our Intrusion Detection and Prevention System (IDS/IPS) from August 5, 2025.
What does this mean in concrete terms?
From August 5, 2025, external access to internal university systems via SSH will no longer be possible if there is no VPN connection. The blocking affects the SSH protocol, regardless of whether you use it via the standard port 22 or another port. This measure affects in particular
- Administrators who manage servers or devices via SSH
- Users who access Linux systems or Raspberry Pi devices within the university network, for example
Background to the measure
Secure Shell Protocol is a frequent target of automated attacks and scanning activities. By blocking the protocol on the IDS/IPS, we increase the security of the university network and better protect our internal systems from unauthorized access.
What do you have to do?
If you would like to continue accessing systems in the university network via SSH, please use a VPN connection first. You can find information on VPN dial-in on our website: https://www.uni-kassel.de/go/vpn
Without an active VPN connection, access via SSH will no longer be possible from 05.08.2025.
If you have any questions
please contact the information security officer:
- E-mail: isb[at]uni-kassel[dot]de
- Phone: 0561 804-2910
Thank you for your understanding and your support in improving IT security at our university.