Re:

The problem is on the PC end.   Intel architecture's use a 'byte-swapped'
format for storing integers and other variables.   In other words, they
store the bytes for an integer with the LSB first, and the MSB last.

However, the TCP/IP standard (as well as the AS/400 itself) do not use
this byte swapped format.

So, when your PC program does a 'sin_port = 3005' it won't work.   (your
PC's representation of 3005 is different from the network's)

There should be C functions that can be used to convert these values.  I
know that in UNIX versions of C, you'd do:

addr.sin_port = htons(3005);

But, I don't know what the proper function is in Windows (it may be the
same, I just don't know)

At any rate, it should get you on the right track.           



On Mon, 23 Jul 2001, srichter  wrote:

> 
> Hello all,
> 
> I am attempting to socket from a win95 pc to an as400. Both systems are on 
>the same local ethernet lan. Both behind the firewall.
> When I run connect( ) on the pc, a "WSAECONNREFUSED" ( the attempt to connect 
>was forcefully rejected ) error code is returned.
> 
> My "Listen" pgm is running on the as400.  It was able to rcv data on a 
>loopback test, so I am reasonably sure it is coded correctly.
> 
> Do I have to enable anything on the 400 or pc before socketing from one 
>system to the other?  Any ideas?  Why the WSAECONNREFUSED error?
> 
> Does the 400 log socket connection attempts that are refused?
> 
> Thanks,
> Steve Richter
> 
> Here is the code.  First the c code on the pc, then the rpg ile as400 code.
> 
> {
> SOCKET hSock;
> SOCKADDR_IN addr ;
> WSADATA wsaData ;
> int nRc ;
> CString sError ;
> WORD wWsaVer ;
> 
> wWsaVer = MAKEWORD( 2, 2 ) ;
> nRc = WSAStartup( wWsaVer, &wsaData ) ;
> 
> hSock = socket (AF_INET, SOCK_STREAM, 0) ;
> FillMemory( &addr, sizeof(addr), 0 ) ;
> addr.sin_family = AF_INET ;
> addr.sin_addr.s_addr = inet_addr( "172.xx.y.z" ) ;
> addr.sin_port = 3005 ;
> nRc = connect( hSock, (LPSOCKADDR)&addr, sizeof(addr) ) ;
> if ( nRc != 0 )
> {
> sError = subsGetSocketError( ) ;
> subsMessageBox( sError, "Socket Error" ) ;
> }
> nRc = WSACleanup( ) ;
> return ;
> }
> 
> ** Create the socket.                                                
>  C                   Eval      SD = Socket (AF_INET: SOCK_STREAM: 0 )
> 
>  ** If socket failed - End the server program with dump               
>  C                   If        SD < 0
>  C                   Eval      rc = SockError('ServerSocket')
>  c                   Goto      EndPgm
>  C                   EndIf
> 
> ** Bind - set local address for the socket.
>  C                   Eval      SocketAddr = *ALLX'00'
>  C                   Eval      SinFamily  = AF_INET
>  C                   Eval      SinPort    = 3005
>  C                   Eval      SinAddr    = INADDR_ANY
>  C                   Eval      rc = Bind (SD: %ADDR(SocketAddr)
>  C                                          : %SIZE(SocketAddr))
>  C                   If        rc < 0
>  C                   Eval      rc = SockError('ServerBind')
>  c                   Goto      EndPgm
>  C                   EndIf
> 
> ** Listen - Invite incoming connections.
>  C                   Eval      rc = Listen (SD: 1)
>  C                   If        rc < 0
>  C                   Eval      rc = SockError('ServerListen')
>  c                   Goto      EndPgm
>  C                   EndIf
> 
>  ** Accept - Wait for connection request and Make connection.
>  **   Accept incoming connection request from the client.
>  **   A new socket (SD2) is created for the client.
>  c                   Eval      SD2 = Accept( SD:
>  c                                           %Addr(AccpAddr):
>  c                                           %Addr(AccpAddrLgth) )
>  C                   If        rc < 0
>  C                   Eval      rc = SockError('ServerAccept')
>  c                   Goto      EndPgm
>  c                   EndIf
>                 
>                                                                         
> 
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