cryptPopData() returns error -16 with TLS

Hello,

I'm trying to establish a TLS session using the current version of cryptlib
under MSVS C++ Express 2010/Windows 7 as a client against a server application
which is TLS-enabled via stunnel! Sending messages using cryptPushData() seam to
work fine (according to the log entries of the server application) but
cryptPopData() returns -16 (CRYPT_INTERNAL_ERROR). The values of the attributes
CRYPT_ATTRIBUTE_ERRORTYPE and CRYPT_ATTRIBUTE_ERRORLOCUS after the error has
occured are 0. An attempt to get the value of the attribute
CRYPT_ATTRIBUTE_ERRORMESSAGE returns with the error code -43.

Here is the code:

CRYPT_SESSION cryptSession;
status = cryptInit();

if ( status == CRYPT_OK ) {

  /* Create the session */
  status = cryptCreateSession( &cryptSession, CRYPT_UNUSED, CRYPT_SESSION_SSL );
}

if ( status == CRYPT_OK ) {
  /* Add server name */
  int len = strlen(serverName);
  status = cryptSetAttributeString( cryptSession, CRYPT_SESSINFO_SERVER_NAME,
serverName, len );
}

if ( status == CRYPT_OK ) {
  /* Add server port */
  status = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_SERVER_PORT,
serverPort );
}

if ( status == CRYPT_OK ) {
  /* Activate session */
  status = cryptSetAttribute( cryptSession, CRYPT_SESSINFO_ACTIVE, 1 );
}

if ( status == CRYPT_OK ) {
  /* Exchange data with the server */
  int bytesCopied = 0;

  int bufferSize = 256;
  char* buffer = new char[bufferSize + 1];

  /* Discard initial response */
  status = cryptPopData( cryptSession, buffer, bufferSize, &bytesCopied );
  if ( status == CRYPT_OK ) {
    printf("\nGot data: %s", buffer);
  }
...

What am I doing wrong? Any help would be very much appreciated.

Tamim


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