I've got a site to site connection using an ASA5505 (7.2(2)) connecting to our office. Between these offices, we have terminal servers that connect to each other. The ASA seems to be tearing down the telnet connections and the users wind up having to reset the telnet connections. I've already tried changing the TCP connection timeout to 00:00:00 but it's still tearing down the connection. I've also enabled keepalives on the terminal servers but still the disconnects occur. Is there any other setting that's causing this? Is there anything I can change in the ASA to stop it from tearing down connections from a specific IP address?
You probably need to check the 'timeout xlate' as well. It is not a good idea to raise it too high though, as the ASA may run out of resources. Some kind of application level keepalive is a better option.
I just looked at the keepalive settings on the terminal server and I set it to send a keepalive message every 1 minute. I put the ASA in debug mode but I don't see anything coming from the terminal server. Should I see something come through the debug logs?
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...