Yes, I've seen this page before, taht's how I found out how to still ssh into the shelf but it also says that its the legacy system (netapp in this case) that doesn't support a higher encryption level. Is there not a way to enable a higher encryption level on the shelf?
This system is running ONTAP 8.1.1 in 7-Mode (released in 2012), which is no longer supported by NetApp. While support is still available for 7-Mode ONTAP (if running 8.1.4, or 8.2.4), no new feature enhancement work is being undertaken on the platform, and as such, there is no fix planned for this issue.
Our suggested fix is to add in your client's ~/.ssh/config file:
Alternatively, with a valid support contract (and, unfortunately, migrating all the data off and back on, and the addition of a 10Gb Mezzanine card if not already present..), this system can be reformatted to run ONTAP 9.1, which is a Clustered ONTAP only release, and which fixes this issue, but it is by no means the easy option.