Did you manage to resolve this? I am having the same issue (and debug output) although using the latest software 9.6.(2)3 on ASA 5585x in a failover pair in multi-context mode.
When I remove and reapply the scansafe config from "system" space, scansafe starts working for about 10 to 15 minutes; scansafe servers are reachable. Than "show scansafe servers" indicates both primary and backup servers are unreachable. Debug logs says scansafe cloud is down. Telnet to scansafe servers from inside the firewall on port 8080 works. Firewall config remains exactly the same in the working and not working scenarios.
Scansafe does work on the same firewall on the old code release before upgrade 9.2(4)8. We are upgrading code to install Firepower modules in these firewalls.
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...