New Post: entering username before authentication

Hello,

i am trying to connnect to a sonicwall device with ssh.
for the sonicwall i have first to enter first an user for "Login as:" , for example "snwcli"

After that i have to enter username and Password.
------ Putty Screen Looks like ------------------------------

login as: snwcli

                     ,,,,,,,,,,,,,,,
      ,,,mmbbbbbb11111111111111111111111bbbbbmm,,,

,,,b||PPPPPPP||````````````````|PPPPPPPPP111111111111bbm,,
`````` `````PPPP111111111bm,

                                                 ```PP1111111bm,
                                                      `PP111111b,
                                                         |111111:
                                                         .1111P|.

Copyright (c) 2010 SonicWALL, Inc. ,b1PP|`

                                                     ,,||```

User:admin
Password:

NSA 3500>

------------ end of putty screen


So the normal authentication will not work.
Is there a way to connect to such device?
Maybe somebody has an example in vb.net or c'

thank you

Regards