cryptPopData returning 0 bytes

I have two prog comunicating using a SLL channel.

The server enters the waiting state and, as soon as the client flushes the
data it starts running again.
It pops the data, do some work and the pushes and flushed the data.

Just after the client flushes the data it does a popdata to wait for the
server answer butt the return without error and with 0 bytes read before the
server has the chance to push the answer.

I've tryed seting CRYPT_OPTION_NET_READTIMEOUT but the behavior remained
unchanged.

Am I missing something ?

server "code"


	res = cryptCreateSession( &cryptSession, CRYPT_UNUSED,
CRYPT_SESSION_SSL_SERVER );
	/* Add the server key/certificate and activate the session */
	res = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_PRIVATEKEY, privKey
);
	res = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_SERVER_PORT,
thisPtr->port );

	res = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_ACTIVE, 1 );

	// some work

	res  = cryptPushData( cryptSession, &buf, sizeof(buf), &bytesCopied );
	res = cryptFlushData( cryptSession );

	res = cryptDestroySession( cryptSession );

client "code"


	int res = cryptCreateSession( &cryptSession, CRYPT_UNUSED,
CRYPT_SESSION_SSL );
	res = cryptSetAttribute( cryptSession, CRYPT_OPTION_NET_READTIMEOUT, 30 );
	res = cryptSetAttributeString( cryptSession, CRYPT_SESSINFO_SERVER_NAME,
serverAddress, strlen(data->serverAddress) );
	res = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_SERVER_PORT, port );
	res = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_ACTIVE, 1 );
	res = cryptPushData( cryptSession, &buf, sizeof(buf), &bytesCopied );
	res = cryptFlushData(  cryptSession );
	res = cryptPopData( cryptSession, &answer, sizeof(answer), &bytesCopied );
// this returns OK but with bytesCopied with 0
	res = cryptDestroySession( cryptSession );

Thanks in advance,
Jacques
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