Maintenance planned for February 7th closed

The default security settings in newer Linux distributions, such as RHEL 9, mean that you can’t open an SSH connection to machines using the deprecated SHA-1 encryption algorithm. This has become a problem for Tetralith users at NSC attempting to SSH into Rackham as we still use the old and weaker cipher for the SSH host certificates. On February 7, we will begin rolling out new SSH host certificates. For most users, the change will likely not be noticeable. You will NOT and SHOULD NOT receive or accept a warning about changed SSH host keys to our systems - the change will only affect SSH host key certificates. However, for some users running old SSH clients, such as the one in macOS 10.8, you will not be able to SSH into Rackham (or any other UPPMAX system), as the client will not accept the new certificates with modern ciphers. For you, we strongly recommend updating your operating system first and foremost. If that is not possible, please contact us at for assistance.

Any disturbances on the accessible systems while the service window remains open should be assumed as related to the service window. Please hold contacting the support until the service is announced completed. You can follow our progress on this page throughout the day.

Update 2024-02-07 17:00

Maintenance completed.

Update 2024-02-07 15:00

Maintenance for all systems is about to complete.

Update 2024-02-07 12:00

Maintenance progressing without issues.

Update 2024-02-07 09:00

Maintenance begins.