We run a Windows network at work with mostly XP clients. We have a few OSX users that need to connect to the shares on the Windows Server 2003 Domain Controler/File Server. I was unable to connect via smb://IP_ADDRESS until I made a few modifications on the server. This affects how Windows encrypts information sent to and from it.

Run "regedit" (Start > Run > "Regedit" {return}) and type the following:

HKEY_LOCAL_MACHINE System CurrentControlSet Services LanManServer Parameter

Then double click on RequireSecuritySignature and set its value to "0" {zero}.

If your server is also a domain controller, you need to open the Domain Controller Security Policy option from Administrator Tools (Administrative Tools > Domain Controller Security Policy) once there, navigate to Local Policies > Security Options and disable the following two options:

  • Microsoft network server: Digitally sign communications (always)
  • Microsoft network server: Digitally sign communications (if client agrees)
Rebot your server and you should be all set.