Set a specific management url for jweb for e.g. so when you access the public IP it does not bring up the web management. If you need the web management then you would simply add the http://<IP>/jwebmgmt
# set system services web-management management-url jwebmgmt;
# set system services web-management http interface ge-0/0/0.0
# set system services web-management http interface vlan.0 <=== need to add an IP that the vlan clients in trust use as the gateway and that you use for web management