The message you have posted says that since the user request is hitting an authorization policy where shell profile is set as deny access. This could be a default shell profile. I would suggest if you can go to access-policies > edit the authorization policy and change the shell profile to permit access.
If you're unsure which authorization policy this user is trying to connect then go to the logs and click on the magnifyng glass that would give you detailed information about the poicy being used.
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...