SBS 2008: Issues after disabling IPv6

If you uncheck the IPv6 protocol from your network interface card on your Windows SBS 2008 server you may see the following issues after a reboot: Microsoft Exchange services fail to start Server hangs at "Applying Computer Settings..."  (can eventually logon after 30 - 60 minutes) Network icons show as offline Some or all of […]

If you uncheck the IPv6 protocol from your network interface card on your Windows SBS 2008 server you may see the following issues after a reboot:

  • Microsoft Exchange services fail to start
  • Server hangs at "Applying Computer Settings..."  (can eventually logon after 30 - 60 minutes)
  • Network icons show as offline
  • Some or all of the following events

Application Log Events: SBS 2008 is designed to fully support IPv6 and has IPv6 enabled by default.  Most users should never need to disable IPv6, however if you must disable IPv6 here is how to disable it properly:

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 (http://support.microsoft.com/kb/322756/)

  1. Click Start, type regedit in the Start Search box, and then click regedit.exe in the Programs list.
  2. In the User Account Control dialog box, click Continue.
  3. In Registry Editor, locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\
  4. Double-click DisabledComponents to modify the DisabledComponents entry.

    Note If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:

    a.In the Edit menu, point to New, and then click DWORD (32-bit) Value.
    b. Type DisabledComponents, and then press ENTER.
    c. Double-click DisabledComponents.

  5. Enter "ffffffff" (eight f’s), and then click OK
  6. Reboot the SBS 2008 server.

For more information please see:

Source:→ Microsoft