samba 3.6.23-30 on CentOS -> error in smbclient

Hi,

last night our Linux-Servers made an update of samba from 3.6.23-25 to 3.6.23-30. After that, no smblient is possible to our NetApp:

Domain=[STADT-MH.DE] OS=[Windows Server 2008 R2 Standard 7601 Service Pack 1] Server=[Windows Server 2008 R2 Standard 6.1]
ntlmssp3_handle_neg_flags: Got challenge flags[0x60898205] - possible downgrade detected! missing_flags[0x00000010] - NT_STATUS_RPC_SEC_PKG_ERROR
session setup failed: NT_STATUS_MORE_PROCESSING_REQUIRED
did you forget to run kinit?

Any idea?

Rolling back to samba 3.6.23-25 works! But we want to fix the security-issues with samba 3.6.23-25.

Server-OS is CentOS6, NetApp is 8.3.1P2 Cdot.

Thanks!

Jens