6|Jun 08 2007 14:15:22|302014: Teardown TCP connection 58273 for outside:/5255 to inside:/24781 duration 0:01:52 bytes 4200 Parent flow is closed
6|Jun 08 2007 14:15:22|302014: Teardown TCP connection 57985 for outside:< IP Add>/5252 to inside:/21 duration 0:02:26 bytes 797 TCP FINs
First teardown is tearing the connection to control channel of your FTP server. The reason, TCP FINs, now we need to find who is actually sending the FIN flag, client or server. For this purpose, you may set sniffer on your FTP server or on firewall to track down the exact sequence of the connection.
As control channel has been closed, your data connection is also torn down as control channel is the parent connection for data connection. Hence the reason "Parent flow is closed" for tearing the data connection.
We need to track the connection of control channel and find who and why is FINs being sent.
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...