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Check the security flow status. Juniper SRX has two mode; flow mode & packet mode. Flow mode works in Firewall where you have all the security zone. In Packet mode SRX basically works as router and there will no security zone and other firewall configuration.

dhakacom@rt-06-srx.dhakacom.com> show security flow status
fakrul@rt-06-srx.dhakacom.com> delete security
fakrul@rt-06-srx.dhakacom.com> set security forwarding-options family mpls mode packet-based
fakrul@rt-06-srx.dhakacom.com> set security forwarding-options family iso mode packet-based
fakrul@rt-06-srx.dhakacom.com> set security forwarding-options family inet6 mode packet-based
fakrul@rt-06-srx.dhakacom.com> commit and-quit

After changing the mode; you need to reboot your box.

fakrul@rt-06-srx.dhakacom.com> request system reboot