Networking XP with the dreaded Vista

This command reports the node type, among other information. It should be Hybrid or Unknown, but not Point-to-Point (p-node, actually a mistaken interpretation of Peer-to-Peer), because that would work only when a WINS server is present.

If the node type is P-t-P, you can use regedit.exe to go to

HKEY_LOCAL_MACHINE
 \System
  \CurrentControlSet
   \Services
    \Netbt
     \Parameters

and delete any of the two values NodeType and DhcpNodeType if they exist, forcing Windows to fall back to its default node type, which should be Hybrid. Reboot.

Check to see if Vista is set to send both LM and NTLM security
responses. If you are running Ultimate or Business you can use the
security policy snap-in. Just type secpol.msc. Drill into Local Policy
-> Security Options and find entry for Network security: LAN Manager
authentication level. Change the setting so that Vista will "Send both
LM & NTLM responses - use NTLMv2 session security if negotiated". If
you are running the home flavor of Vista , you need to do this in the
registry.

Open regedit and drill into: HKLM ->System ->CurrentControlSet
->Control -> LSA
In the right pane, look for "lmcompatibilitylevel" and change the data
value from 3 to 1.

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