No it isn't, you can try the following if you have access to the SP.
Enter the following two commands:
security ssh remove -vserver <cluster> -mac-algorithms umac-128
security ssh remove -vserver <cluster> -mac-algorithms umac-128-etm
and now add the "-etm" back again:
security ssh add -vserver <cluster> -mac-algorithms umac-128-etm
Test if you can do a SSH to the controller, you will see, you can't...
Remove it again:
security ssh remove -vserver <cluster> -mac-algorithms umac-128-etm
And add it again but before the "-etm" add the other:
security ssh add -vserver <cluster> -mac-algorithms umac-128
security ssh add -vserver <cluster> -mac-algorithms umac-128-etm
Then yo can do a SSH to the ccontroller.
Must be a bug...