Re: HTTP intermittent daily failures, only between 4:02:30 thru 4:04:30

We are having HTTP intermittent daily failures, only between 4:02:30 thru 4:04:30.
Majority of the transactions are successful within the same window.
The problem has existed since May 2018.

We now have a 2nd, new HTTP app, different IP and port, presenting the same issue.

Not a load issue.
We run tens of thousands transactions later in the day, not a single error.
Both use non-persistent connections, meaning we open/close the ports for every process.
V7R3, latest cume and groups.
NonSSL.
I side - RPGLE client application utilizing RXS_Transmit()
Remote - 3rd party proprietary apps.
5 hops, 3 firewalls, several switches and routers.

From a WireShark pcap trace run from the I, IBM confirmed that RST flag is being set, from the remote IP, causing the connection to reset/close.

We've been unable to determine the cause the RST.
What process and where would this be running for this brief two minutes window (4:02:30 thru 4:04:30) that would cause RST, reset/closing the connection.

Anyone in the group experience similar behavior and/or know how to isolate the root cause/resolution?

Thank You
_____
Paul Steinmetz
IBM i Systems Administrator

Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071

610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home

psteinmetz@xxxxxxxxxx<mailto:psteinmetz@xxxxxxxxxx>
http://www.pencor.com/