Many factors go into determining which Domain Control will validate a logon. Here is a number of methods that help insure that a specific Domain Controller on a local sub-net validates the logon:
1. Use Regedt32.exe to browse:
Edit or Add Value the following type REG_DWORD values:
NodeType - set to a 4 (m-node/mixed node).
EnableLMHOSTS set to a 1 to enable LMHOSTS.
2. Use a true ASCII editor like Edit from a cmd prompt (not NotePad) to edit:
%SystemRoot%\system32\drivers\etc\LMHOSTS (you may need to copy LMHOSTS.SAM) and add an entry at the top for the BDC:
IP_ADDRESS_OF_BDC "DOMAINNAME \0x1C" #PRE where the entire entry in quotes is exacly 20 characters.
Make sure there are a few (3 or 4) blank lines at the bottom of the file.
Then type NBTSTAT -R (use exact case) to reload the LMHOSTS file and NBTSTAT -c to verify that the 1C entry is in the cache.
You can either reboot the client or use NLTEST or NETDOM from