With the same FTP Client behind the firewall, we are trying to access 2 different FTP servers on Internet. The 1st FTP server is working without issue and able to transfer file.But for the 2nd FTP server we unable to transfer the file.
FTP inspection is enabled on the firewall. We are getting the attached error on the packet capture.
What is the flag [RST,ECN] meant.
Destination IP Source IP TCP 54 ftp> 11092 [RST,ECN] Seq=2 Win=65026 Len=0
the flags are not part of the problem here. RST ist the TCP-Reset, ECN ist Explicit Congestion Notification which ist used with QoS.
Very often FTP-Problems are caused by misconfigured FTP-Servers. That is often the case when the server-Admin is not aware of the firewall and configures the ftp-server-app with the public IP. I have seen that many times, especially with Cerberus-FTP-servers.
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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...