Let me explain... You have put interface ge-0/0/15.0 into zone untrust. ge-0/0/15.0 should be in zone trust. If you look
at the config of that interface it has famliy ethernet switching configured with vlan trust ( vlan trust hasbeen assigned as your internal vlan) and is assigned to zone trust (you internal zone)
zone untrust is your "external / internet zone"
As I look at you config interface ge-0/0/0 looks like to be your interface connecting to the "world / internet" so what you need to do is the following
when you are in config mode:
delete zone untrust interfaces
delete zone untrust interfaces ge-/0/0/15.0
#put ge-0/0/15.0 into zone trust
set zone trust interfaces ge-0/0/15.0
#put your external interface into zone untrust
set zone untrust interfaces ge-0/0/0.0