3288077 - JCO_ERROR_ILLEGAL_ARGUMENT: connection count argument value 0 is not in the valid range

Symptom

RFC communication between the Java stack and an ABAP system fails. As a result, the RFC server cannot start or register correctly in the SAP gateway.

The following error can be found in the dev_jco_rfc.log file:

Exception occured while checking gateway connections
[EXCEPTION]
com.sap.conn.jco.JCoRuntimeException: (131) JCO_ERROR_ILLEGAL_ARGUMENT: connection count argument value 0 is not in the valid range [1..100]; recommended value is 2
    at com.sap.conn.jco.rt.DefaultServer.setConnectionCount(DefaultServer.java:887)
    at com.sap.conn.jco.rt.DefaultServer.updateRunning(DefaultServer.java:140)
    at com.sap.conn.jco.rt.DefaultServer.update(DefaultServer.java:211)
    at com.sap.conn.jco.rt.DefaultServer.<init>(DefaultServer.java:119)

Product

CONNECTOR FRAMEWORK all versions

Keywords

JCO_ERROR_ILLEGAL_ARGUMENT, JCo Server Configurator, Java Connector, JCo , KBA , BC-MID-CON-JCO , Java-Connector , BC-XI-CON-RFC , RFC Adapter , How To

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