Even the latest versions of Samba via yum updates has troubles talking to Windows 2008 Domain Controllers. A partial solution was found here. Upon an upgrade to the AD environment, winbind starts throwing errors like the one below: Aug 16 16:20:38 ourhost winbindd[2459]: rpc_api_pipe: Remote machine OURDOMAINCONTROLLER.ourdomain.com pipe \NETLOGON fnum 0x800areturned critical error. Error was [...]