We have implemented Clientless SSL VPN on an ASA5520 - OS 8.0.4(28). It now appears that there is a known bug when trying to use this feature through a proxy server. A workaround option is to configure smart tunnels, which we have tried but still without success. The Client log in screen comes up OK and we can login and select Application Access. The following screen says that the smart tunnel has started successfully but the local application we select (mstsc.exe) does not work. Has anyone successfully configured this workaround ? I would appreciate any assistance to resolve this issue.
Use the Proxies pane to configure the security appliance to use external proxy servers to handle HTTP requests and HTTPS requests. These servers act as an intermediary between users and the Internet. Requiring all Internet access via servers you control provides another opportunity for filtering to assure secure Internet access and administrative control.
Take a look here for configuring the use of external proxy sever using clientless SSL VPN:
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...