I have a more important question.
What apps are you running to the remote site that require APPC over TCP/IP ?
APPC over TCP/IP is probably not needed in most cases today unless you're doing some SNA specific stuff.
You could also write a job that circles and pings the remote servers every xx seconds if there's not a keep alive setting in your APPC apps.
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date: Mon, 16 Sep 2013 09:19:08 -0700 (PDT)
from: jklipa <jklipa@xxxxxxxxx>
subject: Keeping A Specific TCP/IP Port Alive
Keep Alive APPC over TCP/IP -?iSeries Connections Crossing a Firewall
There is a potential problem that can adversely affect?communication sessions between?
AS/400s within Our network and AS/400s outside?of Our network. What I?m hoping?
to find is a way to keep a connection alive to?a specific ?target? port across a firewall.?
(Because I?m old school, I?m going?to refer to our iSeries boxes as AS/400?s for nostalgic?
purposes. The earliest?O/S version we?re running is V5R4M0.) There are several AS/400s?
inside and outside our network that we need to communicate with on a daily basis...
This problem occurs when a specific set of circumstances are?encountered.
1.)??? An AS/400 (source) server inside Our network?firewall attempts to communicate?
with an AS/400 (target) server that lives?outside Our network firewall. For example,?
source server A attempts to?connect with target server Z. Or vice versa.
2.)??? More than one communication link is??established? between the source/target systems.
3.)??? One or more of the existing connections have?been idle so long they have exceeded?
the firewall-imposed timeout and are?essentially ?walking dead? connections which cannot be revived.
4.)??? The source system requires more than one?simultaneous connection to the target system.
(This is my understanding of how things work, I could be wrong...)