jco connection error com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNIC

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hi friends

we have an issue with the jco connection through the a rfc connction

com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=cgslsvr1 GROUP=PUBLIC R3NAME=CGQ MSSERV=sapmsCGQ PCS=1 ERROR hostname 'cgslsvr1' unknown TIME Wed Jul 9 04:46:06 2008 RELEASE 700 COMPONENT NI (network interface) VERSION 38 RC -2 MODULE nixxhsl.cpp LINE 223 DETAIL NiHsLGetNodeAddr: hostname cached as unknown COUNTER 2

i have tried all the possible ways to troubleshoot this issue but i couldnt solve the issue

i have set the sapms(sid) 36(instance no )/tcp in sevices file in etc (aix 5.2)

i have set this in frontend E.P server and backend sever r/3 also.

i have set smlg ip address and rfc enable also .

i have configured the backend abap system in sld .

i have restarted the sever after setting the parmeters .

every thing i have done but where went wrong i dont know help if any clue is there

thanks in advance

raja