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Can not connect using JCO

Hi, I am trying to access an R/3 system from Java using the JCO.

The connection code is : (text between '<' and '>' replaces actual values)


mConnection = JCO.createClient(

"<client>", // SAP client

"<user>", // userid

"<password>", // password

"<languaje>", // language

"<host_name>", // application server host name

"00" // SAP system number




And the error output:

-$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to SAP gateway failed

Connect_PM GWHOST=<host_name>, GWSERV=sapgw00, ASHOST=<host_name>, SYSNR=00

LOCATION CPIC (TCP/IP) on local host

ERROR partner not reached (host <host_name>, service 3300)

TIME Thu Jul 08 10:57:31 2004


COMPONENT NI (network interface)


RC -10

MODULE ninti.c

LINE 979

DETAIL NiPConnect2


ERRNO 10051

ERRNO TEXT WSAENETUNREACH: Network is unreachable


at$Client.nativeConnect(Native Method)



at ConexionSAP.main(

Process java exited with code 1


When I exec a niping against <host_name> it can connect through 3200, but not 3300. Srfctest.exe does not connect either. However I can start a Windows Sapgui and connect to R/3 and work as usual. What am I missing here?


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1 Answer

  • Posted on Jul 09, 2004 at 06:04 AM

    Hello Antonio,

    is there a firewall between the computer where the JCO is running and the SAP Application Server?



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