I am trying to join authenticate a linux machine from a Windows 2003 SP2 ADS domain with Microsoft service for unix version 3.5 running I have prior to SP2 been able to connect to the domain with no problem I actually have a machine that was connected prior to the install of SP2 still running and have the same krb5.conf, smb.conf and nsswitch.conf files on both machines. Both machines are running the exact same Distrubution of Linux and Samba and yet machine one authenticates and machine two does not. the error message that I currently get is " ads_join_realm: Operations error " has anyone got any ideas as to a resolution to this problem I have included the following smb.conf [global] wins server workgroup=domainname server string=%h (Xandros Desktop) dns proxy=no name resolve order=hosts lmhosts host wins bcast log file=/var/log/samba/log.%m max log size=1000 syslog=0 panic action=/usr/share/samba/panic-action %d security=ADS encrypt passwords=true passdb backend=tdbsam guest obey pam restrictions=yes invalid users=root map to guest=Bad User passwd program=/usr/bin/passwd %u passwd chat=*Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n . client use spnego=no load printers=no printing=cups printcap name=cups dos filetimes=yes socket options=TCP_NODELAY display charset=iso8859-1 unix charset=iso8859-1 winbind enum users=no idmap uid=10000-20000 winbind enum groups=no winbind separator=+ allow trusted domains=yes template homedir=/home/%D/%U password server=ADSSERVER preserve case=yes template shell=/opt/Shellloader.sh realm=DOMAINNAME case sensitive=no short preserve case=yes os level=20 idmap gid=10000-20000 ; preexec = /bin/mount /cdrom ; postexec = /bin/umount /cdrom nsswitch.conf passwd: compat winbind group: compat winbind shadow: compat hosts: files dns wins networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis krb5.conf [realms] DOMANNAME = { kdc = ADSSERVER } DOMAINSHORTNAME = { kdc = ADSSERVER } [login] krb4_convert = true krb4_get_tickets = true All these files are identical on both machines and both machines are identical in time. ANY SUGGESTIONS...