I tried your command on my SRX and it worked fine:
set security nat destination rule-set dst-nat from zone untrust
I think your mistake would be on the ";" at the end of command, you should try it again without that
I tried your command on my SRX and it worked fine:
set security nat destination rule-set dst-nat from zone untrust
I think your mistake would be on the ";" at the end of command, you should try it again without that