NTLM Pass-Through Authentication fails on Member server, successful on domain controller I'm not sure if this is the right forum, this is the issue i'm experiencing: 2 Domains with no trust (A and B) 2 DC 2003 standard sp2 (ADC1 and ADC2) 1 member server 2003 standard sp2 (AMEMBER3) created account in A Domain with the same name as the account in B domain that account is domain admin in A domain i'm testing NTLM pass-through authentication on the member server from the ADC1 and ADC2: runas /netonly /user:B\appadmin cmd.exe (then it prompts for password which i enter) dir \\AMEMBER3\c$ Logon Failure: unknown user or bad password then an event is logged with NTLMSSP failure 0xC0000064 and in the domain name it's B Domain However if i do from that member server the same test with the same user i get a listing of files on \\ADC1\C$ and \\ADC2\C$ and an event for successful logon in logged with domain name A, i checked lmcompatibilitylevel it's the same on all computers involved - 2 netlogon debugging is enabled but it says that same as logged in events what else can i do?

Hi Avi, "Windows Server 2008 R2 and Windows 7 restricts NTLM authentication usage out of the box. This feature is known as NTLM blocking. NTLM blocking prevents NTLM from being used for authentication." http://www.appassure.com/resources/technical-documentation/ntlm-and-pass-through-authentication/ Hope that will help Regards, Lutz

Hey LutzMH, Thanks for keeping tabs on this thread, this case doesn't involve operating system version higher than windows server 2003, Thanks all the same.