More than likely - there is something on the network that is distrupting the download and recompression of the upgrade package.
If you can - please contact the TAC, open a support case, and also open a tunnel for the appliance. If permissiable, just let us know if it is OK to attempt the upgrade while we are connected through tunnel as well.
Instructions on how to open remote access to ESA:
>techsupport tunnel cisco2013
## Please make sure you use the command above, from its CLI (command line interface), when opening the remote access.
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...