I did find a solution or should I say workaround. Basically I had to change the MTU on the clients having the problem to 1200 and it worked great. Depending on the cleint there are certain registry entries you need to modiy. I would suggest you use a test unit first.
I'm still looking for a more global solution since changing it on the servers or routers didn't work.
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...
[toc:faq]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 and UDP are I...