Hi Sam, Check that you haven't disabled NetBIOS in the Server 2008 R2 machine (in the network interace IPv4, WINS properties). As a quick test, does accessing the full DNS path work? For example \\machinea.yourdomain.com\c$ ? Cheers, Lain

Do you logged in with usernames with passwords? Make sure no blank passwordsThank you, Shani

Just install and join window 2008 r2 server into window 2003 native domain. I can't access UNC path (\\machina\c$) shared in window XP. I confirm both machine without turn on firewall and also if using window XP to access same UNC path shared folder, it is work. In window 2008 r2 server, i can ping the host name "machina" but can't net use to map this share folder. Pls advice. THx !!

The "Network discover" is activated?

activated !!

check the ntlm authentication options on both machines. Review this security setting "Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network Security: LAN Manager authentication level"

Check the firewall settings, are you able to pull up the UNC path to that machine from a different machine that isn't the 2008 server?MCP MCSA MCSE MCTS MCITP CompTIA A+ CompTIA Net+ CompTIA Sec+

Already turn off firewall setting. Yes, i can pull up the UNC path to that machine from different machine (is not 2008 R2) And also the setting ""Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Network Security: LAN Manager authentication level" is not define !!

Hi Sam, Check that you haven't disabled NetBIOS in the Server 2008 R2 machine (in the network interace IPv4, WINS properties). As a quick test, does accessing the full DNS path work? For example \\machinea.yourdomain.com\c$ ? Cheers, Lain

Do you logged in with usernames with passwords? Make sure no blank passwordsThank you, Shani