We have a strange issue with our ASA5520 acting as an easy VPN server. We want to run IPSEC over port 10000 just like we did on our VPN3000 concentrators. This works fine for like 5 days and then all of a sudden the ASA stops responding to IPSEC clients (both TCP and UDP) and drops all current IPSEC sessions. Not until I change the TCP port to something else, apply the running configuration and then change back to port 10000 again the ASA starts serving IPSEC clients again. It is like the VPN server functionality is completely turned off or something. There is no trace of any problems in the ASA logs.
Does anybody have any idea what could cause this problem?
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...