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Junos OS runs on the following Juniper Networks® hardware: ACX Series, EX Series, M Series, MX Series, PTX Series, QFabric, QFX Series, SRX Series, and T Series.

These release notes accompany Junos OS Release 12.3X48-D105 for the SRX Series. They describe new and changed features, known behavior, and known and resolved problems in the hardware and software.

Note: On SRX5000 line of devices with SRX5K RE-13-20 (the first generation Routing Engine), a software upgrade to Junos OS Release 12.3X48-D80 and higher releases might fail the pre-check due to insufficient space available on the compact flash. As a workaround, downgrade to Junos OS Release 12.3X48-D10 first and then upgrade to the target release or fresh install the target release using the USB install-media. For more information, see TSB17655

You can also find these release notes on the Juniper Networks Junos OS Documentation webpage, located at