I'm having trouble authenticating users. WinXP will authenticate fine if accessed via hostname... //fileserver/share. Ip does not work.. ie //192.168.1.2/share. Anything below winXP cannot authenticate. Nothing is shown in error logs. wbinfo -t does not work.. returns the following errors. A few hot fixes were applied to domain controlers as well as SP4. No changes were made to samba server. net ads testjoin results ok. As well as all ads commands seem to work fine. wbinfo -u and -g return the correct users and groups. wbinfo -p works also. Any ideas are appriated. Thanks Chris wbinfo -t checking the trust secret via RPC calls failed error code was NT_STATUS_PIPE_NOT_AVAILABLE (0xc00000ac) Could not check secret wbinfo -a cjones plaintext password authentication failed error code was NT_STATUS_NO_SUCH_USER (0xc0000064) error messsage was: No such user Could not authenticate user cjones with plaintext password challenge/response password authentication failed error code was NT_STATUS_PIPE_NOT_AVAILABLE (0xc00000ac) error messsage was: Named pipe not available Could not authenticate user cjones with challenge/response [global] winbind separator = + idmap uid = 10000-20000 idmap gid = 10000-20000 winbind enum users = yes winbind enum groups = yes template homedir = /home/users/%U template shell = /bin/bash smb passwd file = /etc/samba/private/smbpasswd wins server = 172.16.45.63 printing = cups dns proxy = no * encrypt passwords = yes socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192 printcap name = lpstat max log size = 50 preferred master = no writeable = yes realm = gpcom.com security = ADS server string = Samba Server workgroup = GPCOM log file = /var/log/samba/log.%m log level = 1 netbios name = fileserver load printers = yes netbios aliases = fileserver unix charset = CP850 socket options = TCP_NODELAY SO_RCVBUF=16384 SO_SNDBUF=16384 max xmit = 65535 os level = 0