http://blogs.technet.com/isablog/archive/2007/01/18/tcp-connection-established-using-firewall-client-may-close-unexpectedly.aspxFirewall Client software uses a control channel for communication between the Firewall client and ISA Server (UDP or TCP port 1745). If a client application wants to connect to an external computer on TCP port 23 (i.e. telnet protocol) , the control channelen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.technet.com/isablog/archive/2007/01/18/tcp-connection-established-using-firewall-client-may-close-unexpectedly.aspx#601981Fri, 19 Jan 2007 13:58:25 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:601981Stefaan Pouseele Blog » Blog Archive » TCP connection established using Firewall client may close unexpectedly<p>PingBack from <a rel="nofollow" target="_new" href="http://blogs.isaserver.org/pouseele/2007/01/19/tcp-connection-established-using-firewall-client-may-close-unexpectedly/">http://blogs.isaserver.org/pouseele/2007/01/19/tcp-connection-established-using-firewall-client-may-close-unexpectedly/</a></p> http://blogs.technet.com/isablog/archive/2007/01/18/tcp-connection-established-using-firewall-client-may-close-unexpectedly.aspx#880578Fri, 04 May 2007 09:43:12 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:880578DFW Computer Networking<p>Thanks for the good information on the TCP connection closing unexpectedly. &nbsp;I was just curious if there was a way in ISA server to change the amount of time that is used before the connection is timed out? &nbsp;Thanks </p> http://blogs.technet.com/isablog/archive/2007/01/18/tcp-connection-established-using-firewall-client-may-close-unexpectedly.aspx#3252266Tue, 09 Jun 2009 05:39:59 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3252266FLV to MP3 Mac<p>but you are not running IPv6 as Forefront TMG for EBS</p>