You'll usually see this on ACS when the NAS sends out an accounting start record for a userid, but ACS has already received a start record and still thinks that user is logged on. In other words, the NAS sent two start records without a stop record in between them.
This quite often occurs when a user logs into a router, then also goes into enable mode, and accounting is turned on. The router will send a start for the initial login, and another start record for going into enable mode, but there's no stop record in there cause the user never logged out. Nothing to worry about usually.
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...