samba - Feb 2016 - Remote Desktop slow startup in Windows 10 / 8

Hi,
I'm having a slow startup (30") of Remote Desktop Client (mstsc) in 
windows 8 and windows 10. I've tried it in Windows 7 and it starts 
correctly (3-5"). Once connection is stablished it goes smoothly.

I've tried connecting Remote Desktop with an IP and I've got same
behaviour.

When I'm starting Remote Desktop from Windows 10 or 8 I get next message 
in samba AD 4.1.17 contiously:
  Warning: 60 extra bytes in incoming RPC request
[2016/02/22 18:43:33.373483,  3] 
../source4/smbd/service_stream.c:66(stream_terminate_connection)
   Terminating connection - 'dcesrv: NT_STATUS_CONNECTION_DISCONNECTED'

As fur as I know it has something to do with Active Directory schema 
version. ¿Is any ?

Server: Ubuntu 15.10
Samba version: 4.1.17

smb.conf
[global]
         workgroup = ADI
         realm = ADI.LOCAL
         netbios name = DC1
         server role = active directory domain controller
         dns forwarder = 192.168.2.30
         idmap_ldb:use rfc2307 = yes
         log level = 3
         wins support = yes

[netlogon]
         path = /var/lib/samba/sysvol/adi.local/scripts
         read only = No

[sysvol]
         path = /var/lib/samba/sysvol
         read only = No


thank you,
Unai

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