Having a 4215 sensor crash on a signature update is a very common event.
The 4215 sensors only have 512 MB or RAM (most sensors have 1 or 2 GB), this has caused many problems during the update process.
You can try rebooting the sensor several times, if that doesnt bring it back to life, you can try resetting the signature policy back to default, if that doesn't help you'll need to open a TAC case to modify some of the signature build time memory parmeters.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...