ERROR partner '<servername>:sapgw##' not reached

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Hi Folks,

We are trying to connect a standalone Java stack(SAP UCES) system to SAP ISU using an RFC.

Both the systems arein different networks and we have only opened 5XX00 port and 5XX18 port form the Java system and 36XX and 33XX port from the ISU systems. Also the entires for sapmsXX 36XX/tcp entries are added in Java system for commnicating with ISU system using the load balancing method.

When I create a JCo destination from Visual admin from Java stack to ISU system everything works fine. I can see the enty for the Java stack in the ISU system's SMGW transaction. But when I create a RFC destination from Destination in visual admin to ISU system it fails with the below error:

*Error during ping operation: Connect to SAP gateway failed

Connect_PM TYPE=B MSHOST=10.2.180.126 GROUP=SAPCE R3NAME=XX2 MSSERV=sapmsX2 P

CS=1

LOCATION CPIC (TCP/IP) on local host with Unicode

ERROR partner '10.182.17.17:sapgwXX' not reached

TIME Sat Dec 18 20:07:31 201

RELEASE 700

COMPONENT NI (network interface)

VERSION 38

RC -10

MODULE nibuf.cpp

LINE 4601

DETAIL NiBufIConnect: connection pending after 60000ms

SYSTEM CALL connect

ERRNO 55

ERRNO TEXT A connect operation on a socket is not complete.

COUNTER 3*

I have added the entries in the services file but still, I see the above error:

Telnet from Java stack to ISU on port 33XX and 36XX works fine.

One more thing we have done here is there is a IP nat for the ISU. I have already set the parameter gw/alternative_hostnames as per the note Note 148832 - IP address conversion with a firewall, Bt still it gives the above error.

Any thoughts on this issue. I feel there is some network issues, Or Can we set any parameters to over come this issue.

Regards,

Vamshi.