Socket Authenticate a proxy

Hello I am doing a tunneling in C++, I could connect to the proxy but when I send data it ever request with error 407 ( autenticate is requiered).

I try  this

CONNECT server.domain.net:443 HTTP/1.0 
User-Agent:Mozilla/4.0 (compatible; MSIE 5.5; Win32) 
proxy-Connection: Keep-Alive 
Pragma: no-cache 
proxy-Authorization: NTLM TlRMTVNTUAABAAAAt7II4gkACQAxAAAACQAJACgAAAAFASgKAAAAD0xBQlNNT0tFM1dPUktHUk9VUA== 

It is on the microsoft documentation http://msdn.microsoft.com/en-us/library/dd925287%28v=office.12%29.aspx
I remplace the number with my user and password 
example:
proxy-Authorization: NTLM luis:pass
but it did not work. the first question what is the code  TlRMTVNTUAABAAAAt7...... mean? it have and encriptations such 
as  hash or other?? what am I doing bad?? help please.
greets and thanks