How to Create a PCAP packet capture on SRX Branch device
http://aleeboo.com/how-to-create-a-pcap-packet-capture-on-a-j-series-or-srx-branch-device/
How to capture packets on High-End SRX devices
http://aleeboo.com/how-to-capture-packets-on-high-end-srx-devices/
SRX Getting Started – Configure Logging
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16634
SRX Getting Started – Configure Traffic Logging (Security Policy Logs) for SRX Branch Devices
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16509
SRX Getting Started – Configure Traffic Logs (or Security Policy Logs) for SRX High-End Devices
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16506
[SRX] How to enable and view traffic logs in the J-Web/GUI on SRX devices
http://kb.juniper.net/InfoCenter/index?page=content&id=KB19490