DOCUMENT:Q177313 09-AUG-2001 [winnt] TITLE :Installing Multiple 3COM 3C509B PCMCIA Network Interface Cards PRODUCT :Microsoft Windows NT PROD/VER:WinNT:4.0 OPER/SYS: KEYWORDS:kbsetup ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation version 4.0 - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information on how to do this, view the "Restoring the Registry" online Help topic in Regedit.exe or the "Restoring a Registry Key" online Help topic in Regedt32.exe. SYMPTOMS ======== On a computer that already has one 3COM 3C509B PCMCIA network interface card (NIC) installed, if you attempt to make the computer multihomed by installing another identical NIC, the following error message is displayed: Registry service subkey already exists. Unable to access services subkey and registry. As a result, you cannot install a second 3c309B PCMCIA NIC. CAUSE ===== There are two entries in the registry that need to be deleted prior to adding the second 3COM 3C509B NIC. RESOLUTION ========== To successfully install two 3COM 3C509B NICs on the same computer, follow these steps: WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. For information about how to edit the registry, view the "Changing Keys And Values" online Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" online Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. 1. Install the MS Loopback Adapter by using the Network tool in Control Panel. 2. Restart the computer. 3. Remove the first 3COM 3C509B driver. 4. Run Regedt32 and delete the 3COM key entries under the following two locations: HKLM\System\CurrentControlSet\Services\Elink3 HKLM\Software\Microsoft\Windows NT\CurrentVersion\NetworkCards NOTE: There will be one number (1,2,3,...) for each adapter installed. Open each numbered key, and delete the key that contains the 3COM card information. 5. Restart the computer. 6. Install the first and second 3COM 3C509B cards by using the Network tool in Control Panel. 7. Delete the MS Loopback Adapter. 8. Restart the computer Both 3c509B PCMCIA NICs should now be installed and functional. Additional query words: multi-homed multiple 3C509 ====================================================================== Keywords : kbsetup Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 Version : WinNT:4.0 Issue type : kbprb ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.