JSI Tip 1785. Inconsistent registry entries cause loss of TCP/IP and DHCP.

If you can't open the TCP/IP configuration dialog on your Windows NT 4.0 server and you receive Error 2140: An internal Windows NT error occurred, when you start DHCP, you probably have registry conflicts.

To correct the problem, it is necessary to remove and reinstall TCP/IP, using this special procedure:

1. Control Panel / Network / Protocol / TCP/IP / Remove / Yes.

2. Restart your server when prompted.

3. Apply Service Pack 6 or later.

4. Using Regedt32.exe, delete the following registry keys (if present):

  HKEY_LOCAL_MACHINESoftwareMicrosoftDhcpMibAgent  HKEY_LOCAL_MACHINESoftwareMicrosoftDhcpServer  HKEY_LOCAL_MACHINESoftwareMicrosoftFTPSVC  HKEY_LOCAL_MACHINESoftwareMicrosoftLPDSVC  HKEY_LOCAL_MACHINESoftwareMicrosoftNetBT  HKEY_LOCAL_MACHINESoftwareMicrosoftRFC1156Agent  HKEY_LOCAL_MACHINESoftwareMicrosoftSNMP  HKEY_LOCAL_MACHINESoftwareMicrosoftSimpTcp  HKEY_LOCAL_MACHINESoftwareMicrosoftTcpip  HKEY_LOCAL_MACHINESoftwareMicrosoftTcpipCU  HKEY_LOCAL_MACHINESoftwareMicrosoftTcpPrint  HKEY_LOCAL_MACHINESoftwareMicrosoftWins  HKEY_LOCAL_MACHINESoftwareMicrosoftWinsMibAgent  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesDHCP  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesDhcpServer  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesFTPSVC  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLmhosts  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLPDSVC  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesNetBT  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesSimpTcp  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesSNMP  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpip  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWins  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWinSock  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesWinSock2  HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesParametersTcpip

NOTE: NetDriver is your NIC.

     Take ownership and grant everyone full control of the following keys, so that you can delete them:

  HKEY_LOCAL_MACHINESystemCurrentControlSetEnumRootLegacy_DHCP  HKEY_LOCAL_MACHINESystemCurrentControlSetEnumRootLegacy_Lmhosts  HKEY_LOCAL_MACHINESystemCurrentControlSetEnumRootLegacy_LPDSVC  HKEY_LOCAL_MACHINESystemCurrentControlSetEnumRootLegacy_NetBT  HKEY_LOCAL_MACHINESystemCurrentControlSetEnumRootLegacy_TCPIP  HKEY_LOCAL_MACHINESystemCurrentControlSetServicesLanManServerLinkageBind  HKEY_LOCAL_MACHINESystemCurrentControlSetServicesLanManWorkstationLinkageBind

NOTE: Use Security / Owner / Take Ownership
                and Security / Permissions / Everyone / Full Control / Replace Permission On Existing Subkeys.

5. Restart the server.

6. Reinstall TCP/IP (Control Panel / Network / Protocols / Add / TCP/IP Protocol / OK).

NOTE: Respond Yes to dynamically assign an IP address or No to statically assign it.

7. Press OK and Yes to restart the server.

8. Reapply Service Pack 6 or later.

9. Reconfigure TCP/IP.