Hi DAVID FRAGIACOMO,
Take a look to this enh request: CSCum63371.
Seems like the version 9.4.2.6 does not support the manual change of the ssh ciphers, in order to support this command you can upgrade to 9.4(2.99) which is already working or latest.
This are the commands:
-show ssh ciphers
-ssh cipher encryption custom (you can select the ciphers that you want and put them here)
Hope this info helps!!
Rate if helps you!!
-JP-