I have about 30 ASA 5505 firewalls. I am using them to remotely connect to my Allen Bradley PLCs. I use ports 2222 and 44818 to connect to the PLC's from different devices. The problem I am having is that sometimes one of the ports will stop responding. More often than not it is the 44818. To remedy the issue, I remotely connect to the firewall and perform and immediate system reload. After the firewall comes back up, everything works normally.
There is no definite time period that this problem occurs and it does not occur equally across all of the firewalls.
Is this a known issue or is there some sort of resolution?
If you have the port open it should work everytime... so another thing that you can do is check the logs to see what kind of message you get when the connection fails and also run a packet tracer test when it fails (before reloading the device).
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...