OS V5R3M0 : problem to connect

Hi
We have a "home application" which send and receive data with a R3 SAP system by RFC. The R3 system is on kernel 4.6D.
We just apply SDKRFC 640 in our C server programme. It run good with OS400 V5R2M0 but wrong since V5R3M0
the log is :
<i>[<i>i]**** ERROR file opened at 20070517 114710 , SAP-REL 640,0,158 RFC-VER 3  MT-SL                          
T:00000000:00000026 Error</i> in program 'HLSAP640E/HLKA15C': ======> Connect to SAP gateway failed          
Connect_PM  TPNAME=CADPROD.IDOC, GWHOST=10.33.21.10, GWSERV=3300                                                                               
LOCATION    CPIC (TCP/IP) on local host                                                                  
ERROR       hostname '?' unknown                                                                               
TIME        Thu May 17 11:47:10 2007                                                                    
RELEASE     640                                                                               
COMPONENT   NI (network interface)                                                                      
VERSION     37                                                                               
RC          -2                                                                               
COUNTER     2         </i> </i>           
Could you help me please ????
thanks

Hi
I resolved my problem. In fact it was the DNS resolution hostname of the AS400 which was wrong.
So when you use the RFC 640, the RFC function RFCaccept want to resolve the DNS hostname of server whicj ask connection to R/3

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