Working with SSL?

[Tetrapyriarbus]

Sorry to open this here as an issue, but I've been struggling to get this working with SSL and I'm not sure if this is the right place to ask for help. I'm using Visual Studio 2005 to compile ftplibpp and openssl to work on Windows CE.
ftp=new ftplib();
if(ftp->Connect(":990")) {
ftp->SetCallbackCertFunction(CertificateCallback);
ret=ftp->NegotiateEncryption();

NegotiateEncryption stage which is returning with -1 and sometimes popping up a notepad editor with the text "write: errno=0".

Looking into the source of the NegotiateEncrypticon function, it looks like BIO_new_socket is succeeding and it's failing when it calls SSL_connect, but I'm not sure why. Has anyone else successfully connected to ftps and can give me some pointers?