I have the same issue. I can no longer use cbc flavored ciphers, which is apparently all that the Aruba 650 will support. I just updated to the 6.4.3.3 build, and it still throws an error.
I am trying to scp a file from my server to the Aruba.
The error reads:
no matching cipher found: client aes128-cbc,aes256-cbc server aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
What this implies to me, is that teh client (Aruba, in this case) has the ciphers: aes128-cbc and aes256-cbc -- My server is presenting the remainder of the error list.
So far I have had no luck fixing this, but tech support said they should support ctr flavored ciphers. The error, from what I am reading, implies that the controller does not support these ciphers. Any help would be much appreciated.