"Authentication failed" error using paramiko

[sa6113]

I am using this code to connect to a windows machine using paramiko, I have
installed sshd on the machine and it works properly: 

sock.connect((hostname, port)) 
t = paramiko.Transport(sock) 
event = threading.Event() 
t.start_client(event)     
event.wait() 
    if not t.is_active(): 
        print 'SSH negotiation failed.' 
        sys.exit(1) 
else: 
    print "SSH negotiation sucessful" 
    event.clear() 
    t.auth_password(username=username, password=password,event=event) 

if not t.is_authenticated(): 
        print "Authentication failed" 

output: 

SSH negotiation successful 
Authentication failed 

I uploaded log file I am sure about username and password on that machine. 

What is the problem? 

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