RFC sap- as400

Hi everybody's,
I've a problem regarding definition of an RFC destination. Using a RFC function I've to call a non sap abap program; particularly the program resides on as400 server. I've defined a TCP/IP rfc destination in which I've specified the ip of as400 and the name of the program that I need to call. I'm sure that ip is correct because of two systems ping each others, but if I test the connection system responses with the error: "CM_RESOURCE_FAILURE_RETRY". I've searched some oss notes and finally I suppose that some parametrization misses on as400; for example some oss notes ask if a remote shell is enabled onto as400. Someone of you as an idea to verify if a remote shell is present on as400?
A second idea should be that a gateway R/3 misses onto as400; how is possible to install a R/3 gateway on as400?
Thank you in advance
Mike

hello  again
problem not resolved yet.
we made the  rfc return  some more  information:
KEY OF RFC_ERROR_INFO = 'RFC_IO5                          ' 
STATUS OF RFC_ERROR_INFO =  'CODE=CM_PRODUCT_SPECIFIC_ERROR STATUS=??? DATA=??? ID=ooo  '
MESSAGE OF RFC_ERROR_INFO =  ' SAP_CMINIT3 : rc=20 > Connect to SAP gateway failed Connect_
                                                          PM  , SYSNR=20  LOCATION    CPIC (TCP/IP) on local host ERRO
                                                          R       failed to open file sideinfo  TIME        Mon Aug 25
                                                          13:46:53 2008 RELEASE     700 COMPONENT   SAP-GW-LIB (ReadS
                                                          ideInfo) VERSIO '
INTSTAT OF RFC_ERROR_INFO = 'IO HANDLE=4 DRV=EXT LINE=589 CODE=5                         '
i don't  understand this, but maybe one of you can explain it.
thanks again
benny

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