Re: Widnows sending RST in tpc/ip connection


"Dave Lowther" <davel@xxxxxxxxx> wrote in message
news:OiWa$GD8FHA.1148@xxxxxxxxxxxxxxxxxxxxxxx
> "Niklas Olsson" wrote in message
>>
>> Thank you for the suggestions,
>> however I can't get it to work, but maybe I'm doing it wrong.
>> I used
>> Socket = socket (AF_INET, SOCK_STREAM, 0):
>> and then
>> local_sin.sin_family = AF_INET;
>> local_sin.sin_port = htons (nPort);
>> local_sin.sin_addr.s_addr = htonl (INADDR_ANY);
>> bind (Socket, (struct sockaddr *) &local_sin,
>> sizeof (local_sin)
>>
>> I thought that this might be enough, but is it?
>> I tried also to call listen() after bind but I always end up with windows
>> (or some program other than mine) sending the reset message.
>> Since everything works find if I let winsock connect, there must be
>> something I don't do correctly.
>> (my SYN message seem to be working fine (I get back the SYN,ACK) and in
>> comparassion to the SYN winsock send I can't find any differencies except
>> checksum)
>> I don't have any firewall running that would block.
>
> Is your code a TCP/IP client, or server ?
>
> Probably not necessary but I usually memset() the struct sockaddr with all
> 0's before filling out the required fields.
>
> If it's a client:
> o You shouldn't be setting the port number for bind, in fact why call bind
> at all.
> o You should be calling connect()
>
> If it's a server:
> o You should call socket(), bind(), listen(), accept()
> o You should be setting the port number with bind
> o You should use the socket returned by accept() to talk to the client.
>
> HTH
>
> Dave.
>

Thanks for the suggestions Dave,
The thing is, I can't use Connect() (it's just to slow (if there is no peer
in the other end))
So I communicate directly with the adapter and send my message.
(and my program is a client)
I got fooled earlier that it worked because the windows firewall was on,
which makes the ports stealth if I'm not mistaken but now that I turned it
off, windows will answer with a reset message that the port I send on is not
in use.
But perhaps it's not winsock I should look at, I just want to tell windows
that the port 9704 (or any other I specify) is un use and that it should not
send any reset message.

thanks
/Niklas


.

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