M7 Sprint M7_WLS unlock problem

Need help on this, I got an M7_WLS and I’m trying to unlock it, first I did S-OFF and changed CID to Super CID, that was ok

Then I read SPC ok

Diagnostics ports enabled ok

but when I try to unlock get this message::

Trying to connect in Sprint mode…
Trying to connect on COM356
Checking server connection…
Communicating with the XTC 2 Clip …
Connecting to the server…
Please wait, generating unlock hash…
Server connection failed

I restarted pc, used another pc, rebooted wifi modem, etc but keeps giving that message.

Any advice?