2124330 - max no of 404 conversations exceeded

The Java applications which maintain RFC communication via JCo with ABAP systems are failing.

The traces (e.g. dev_jrfc.*.trc) show errors with max no of 404 conversations exceeded.

e.g.:

"...
Error> occurred  >Thu Jan 29 14:50:41,258<    RfcException: [null]
message: Connect to SAP gateway failed
Connection parameters: TYPE=B DEST=<Java Rfc client> MSHOST=mshost.sample.com MSSERV=sapmsSID R3NAME=SID GROUP=PUBLIC PCS=1

LOCATION    CPIC (TCP/IP) on local host with Unicode
ERROR       max no of 404 conversations exceeded
TIME        Thu Jan 29 14:50:41 2015
RELEASE     742
COMPONENT   CPIC (TCP/IP) with Unicode
VERSION     3
RC          466
MODULE      D:/depot/bas/742_REL/src/krn/si/cpic/r3cpic.c
LINE        15321
COUNTER     73

Return code: RFC_FAILURE(1)
error group: 102
key: RFC_ERROR_COMMUNICATION
..."

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SAP NetWeaver Application Server Java

SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Application Server for Java 7.1 ; SAP NetWeaver Application Server for Java 7.2 ; SAP enhancement package 1 for SAP NetWeaver Application Server for Java 7.1

max, 404, conversations, exceeded, RfcException, gateway, RFC_FAILURE, RFC_ERROR_COMMUNICATION, jco.cpic_maxconv, CPIC_MAX_CONV , KBA , BC-MID-CON-JCO , Java-Connector , Problem