Unable to ping the device, though its directly connected.

• Check the arp table on SRX
• Confirm if the interface is added to correct zone and allow all the service(ping, ssh, ftp, telnet etc and also host inbound service).
• Restarted the nsd daemon

user@root> restart network-security

Note: Please perform the above operation during downtime or safe MW, as all the network service will be restarted.