How to change the multicast address in a Distribute Disk image taks?

I've been struggling to change the IP address used in a multicast task.So far the configuration string used is this:

"-CLONE,MODE=RESTORE,SRC=%IMAGE_FILENAME%,DST=1 -sure -batch -mp -session=54d9d492-c810-486c-8f07-07820ee9d8fa -ip:224.2.0.19:403 -clients=5 -threshold:1 -connecttimeout=5"

Even if I change manually the "224.2.0.19", it comes back to this.

I changed the global option for my multicast IP, restarted the server but no success so far.

I need to change it because the network admin has this only address allowed for multicast.

Thank you.