Hello everyone, system: Debian squeeze samba 3.4.8 I make a samba PDC like one exist in lenny on my network XP PRO an W2K pro can join to the domain machine and users and users can log in the domain. With W7 PRO, after changing registry key : [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters] ?DomainCompatibilityMode?=dword:00000001 ?DNSNameResolutionRequired?=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Netlogon\Parameters] ?RequireSignOrSeal?=dword:00000000 ?RequireStrongKey?=dword:00000000 and modifies security policies : gpedit.msc Windows prameters / security parameters / locales policies / security options : Secutity network : Sen LM and NTLM - Use NTLM2 security session if negociated Join the pc to the domain WORKS whith a DNS error. But when i want to join the user to the domain ( screen : choice of the type of account) Standard account and i have Can't add the user, trust relation error if annyone had an idea ........... thanks -- Gu?nol? Michel Estar Tel : 02 99 88 69 06 Email : gmichel at estar-system.com