Knowledge Base

Error Message When Installing TCP/IP or Adding TCP/IP Service

Article ID: 151237

Article Last Modified on 11/1/2006

APPLIES TO

Microsoft Windows NT Workstation 3.5
Microsoft Windows NT Workstation 3.51
Microsoft Windows NT Workstation 4.0 Developer Edition
Microsoft Windows NT Server 3.5
Microsoft Windows NT Server 3.51
Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q151237

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When you attempt to reinstall TCP/IP or add a TCP/IP service, you may receive one or more of the following error messages:

- Registry service subkey already exists

-or-

- Unable to remove name space provider

RESOLUTION

To resolve this problem, make sure that all of the components of a given TCP/IP Service are properly removed, and then make sure that the following registry subkeys are also removed before you restart the computer:

IMPORTANT: If you have Windows NT 4.0 with Service Pack 2, see the following article in the Microsoft Knowledge Base before removing any registry keys:

162837Replacing TCPIP after SP2 causes STOP 0x00000050

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
NOTE: You may or may not have all of the following Registry entries depending on your TCP/IP configuration.

NOTE: CCS=CurrentControlSet

HKEY_LOCAL_MACHINE\Software\Microsoft\DhcpMibAgent
HKEY_LOCAL_MACHINE\Software\Microsoft\DhcpServer
HKEY_LOCAL_MACHINE\Software\Microsoft\FTPSVC
HKEY_LOCAL_MACHINE\Software\Microsoft\LPDSVC
HKEY_LOCAL_MACHINE\Software\Microsoft\NetBT
HKEY_LOCAL_MACHINE\Software\Microsoft\RFC1156Agent
HKEY_LOCAL_MACHINE\Software\Microsoft\SNMP
HKEY_LOCAL_MACHINE\Software\Microsoft\SimpTcp
HKEY_LOCAL_MACHINE\Software\Microsoft\Tcpip
HKEY_LOCAL_MACHINE\Software\Microsoft\TcpipCU
HKEY_LOCAL_MACHINE\Software\Microsoft\TcpPrint
HKEY_LOCAL_MACHINE\Software\Microsoft\Wins
HKEY_LOCAL_MACHINE\Software\Microsoft\WinsMibAgent

HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\DHCP
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\DhcpServer
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\FTPSVC
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Lmhosts
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\LPDSVC
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\NetBT
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\SimpTcp
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\SNMP
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Tcpip
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\Wins
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\WinSock
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\WinSock2
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\<NetDriver><x>\Parameters\Tcpip
where <NetDriver> is the name of network card installed on system and
where <x> is the number of the network adapter.

It may also be necessary to remove the following keys:

HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_DHCP
HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_Lmhosts
HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_LPDSVC
HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_NetBT
HKEY_LOCAL_MACHINE\System\CCS\Enum\Root\Legacy_TCPIP
HKEY_LOCAL_MACHINE\System\CCS\Services\LanManServer\Linkage\Bind
HKEY_LOCAL_MACHINE\System\CCS\Services\LanManWorkstation\Linkage\Bind
HKEY_LOCAL_MACHINE\SYSTEM\CCS\Services\PPTP

NOTE: Removing these additional keys requires manipulation of the rights on those keys. The default rights for Everyone is Read. This needs to be done for each key you wish to remove. To change the rights, log on as Administrator, run Regedt32.exe, and select the key you want to delete. From the menu, select Security, Owner, Take ownership. Then, Select Security, Permissions, and give full control to Everyone, selecting "Replace permission on existing subkeys."

Restart the computer so that registry changes are recognized by Windows NT.

If Remote Access Service (RAS) is installed, you may also need to manually delete the following RAS and NDISWANx registry entries:

Locate HKEY_LOCAL_MACHINE\System\CCS\Services\NetBIOS\Linkage.

Double-click Bind, and remove all NetBT_xxxx entries, such as:

        \Device\NetBT_El59x1
        \Device\NetBT_NdisWan1
        \Device\NetBT_NdisWan2
        \Device\NetBT_NdisWan3
        \Device\NetBT_NdisWan4
   HKEY_LOCAL_MACHINE\System\CCS\Services\RASARP
   HKEY_LOCAL_MACHINE\System\CCS\Services\RASAUTO
   HKEY_LOCAL_MACHINE\System\CCS\Services\RASMAN
  HKEY_LOCAL_MACHINE\System\CCS\Services\RASACD
  HKEY_LOCAL_MACHINE\System\CCS\Services\RASPPTPE
  HKEY_LOCAL_MACHINE\System\CCS\Services\RASPPTPF
  HKEY_LOCAL_MACHINE\System\CCS\Services\RASPPTPM
  HKEY_LOCAL_MACHINE\System\CCS\Services\NDISWANx\Parameters\TCPIP
(where x reflects the numbers corresponding to the preceding  \Device\NetBT_NDISWANx.
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASARP
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASACD
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASAUTO
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASMAN
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASPPTPE
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASPPTPF
  HKEY_LOCAL_MACHINE\System\CCS\ENUM\Root\Legacy_RASPPTPM

Additional query words: remove manual manually regedt32 how to howto removing tcpip

Keywords: kbfaq kbnetwork kbprb KB151237

Microsoft KB Archive/151237

Error Message When Installing TCP/IP or Adding TCP/IP Service

SYMPTOMS

RESOLUTION