VPN Client 3.1.1 - Exchange Server Unavailable from *some* networks
I have some windows 2000 and winXP clients using the 3.1.1 VPN client. they can always successfully establish a VPN connection but sometimes they get the message "the exchange server is unavailable". when they're connected to an ISDN or DSL line at home they can access our exchange server fine - IMAP connection. when they're in certain hotels they can and others they can not. we have 1 small remote office behind a firewall running DHCP and NAT on the inside and they can't connect to the exchange server there. I'm wondering if NAT is the problem? shouldn't be but I don't get it. any guidance would help, thanks!
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...