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Systems, Applications, and Products (SAP) for data processing is an industry leading enterprise software solution that is widely used among product and process oriented enterprises for finance, operations, HR and many other aspects of a business. SAP ERP solutions provide reliable and efficient platforms to build and integrate enterprise or business-wide data and information systems with ease. One of the drawbacks however is vendor lock-in and the relative inflexibility of SAP solutions to align itself with the business model or customization required. Having understood these challenges, SAP software vendors are moving towards exposing their solutions to SOA.

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This file should be named <SAP-GWHOST>.server. For example, if the name of your SAP gateway is SAPSYS01, the name of the file should be SAPSYS01.server and the configuration can be as follows:

jco.server.gwhost=/H/203.143.18.246/S/3299/H/155.56.49.28/H/cpccr01 
jco.server.connection_count=2 
jco.server.progid=JCOSERVER01 
jco.server.gwserv=3326 
jco.server.repository_destination=SAPSYS01 
jco.server.name=JCOSERVER01 
jco.server.unicode=1 

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• How to handle the Server unknown error

  An example of this error message is as follows:
  

  Code Block

  [2010-10-25 19:53:00,405] ERROR - DefaultErrorListener Exception occured on : JCOSERVER01 and connection : null com.sap.conn.jco.JCoException: (129) JCO_ERROR_SERVER_STARTUP: Server startup failed at Mon Oct 25 19:53:00 IST 2010. This is caused by either a) erroneous server settings, b) the backend system has been shutdown, c) network problems. Will try next startup in 1 seconds. Could not start server: Connect to SAP gateway failed Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00 ERROR service 'sapgw00' unknown TIME Mon Oct 25 19:53:00 2010 RELEASE 720 COMPONENT NI (network interface) VERSION 40 RC -3 MODULE nixxsl.cpp LINE 184 DETAIL NiSrvLGetServNo: service name cached as unknown COUNTER 2 at com.sap.conn.jco.rt.DefaultServer.openConnection(DefaultServer.java:1168) at com.sap.conn.jco.rt.DefaultServer.openConnections(DefaultServer.java:1057) at com.sap.conn.jco.rt.DefaultServer.adjustConnectionCount(DefaultServer.java:1004) at com.sap.conn.jco.rt.DefaultServerManager$DispatcherWorker.run(DefaultServerManager.java: 299) at java.lang.Thread.run(Thread.java:619) Caused by: com.sap.conn.jco.JCoException: (129) JCO_ERROR_SERVER_STARTUP: Could not start server: Connect to SAP gateway failed Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00 ERROR service 'sapgw00' unknown TIME Mon Oct 25 19:53:00 2010 RELEASE 720 COMPONENT NI (network interface) VERSION 40 RC -3 MODULE nixxsl.cpp LINE 184 DETAIL NiSrvLGetServNo: service name cached as unknown COUNTER 2 at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcServer.accept(MiddlewareJavaRfc.java:2135) at com.sap.conn.jco.rt.ServerConnection.accept(ServerConnection.java:380) at com.sap.conn.jco.rt.DefaultServer.openConnection(DefaultServer.java:1149) © 2012 WSO2 .. 4 more Caused by: RfcException: [null] message: Connect to SAP gateway failed Connect parameters: TPNAME=JCOSERVER01 GWHOST=cynthia GWSERV=sapgw00 ERROR service 'sapgw00' unknown TIME Mon Oct 25 19:53:00 2010 RELEASE 720 COMPONENT NI (network interface) VERSION 40 RC -3 MODULE nixxsl.cpp LINE 184 DETAIL NiSrvLGetServNo: service name cached as unknown COUNTER 2 Return code: RFC_FAILURE(1) error group: 102 key: RFC_ERROR_COMMUNICATION at com.sap.conn.rfc.engine.RfcIoControl.error_end(RfcIoControl.java:255) at com.sap.conn.rfc.engine.RfcIoControl.ab_rfcaccept(RfcIoControl.java:43) at com.sap.conn.rfc.api.RfcApi.RfcAccept(RfcApi.java:41) at com.sap.conn.jco.rt.MiddlewareJavaRfc$JavaRfcServer.accept(MiddlewareJavaRfc.java:2121) ... 6 more

   The solution to overcome this is to add your SAP server names to the /etc/services file with the relevant ports. For example, the following lines can be added if we consider the example error given above.
  

  Code Block
  sapgw00 3300/tcp sapgw01 3301/tcp