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Server 2008 locks up on login?

If a SBS 2008 server is locking up or freezing when you log in its probably due to IPv6. SBS 2008 is designed to fully support IPv6 and has IPv6 enabled by default. The lock ups are caused by IPV6 and Exchange services being in a constant state of starting and stopping.

However you cannot just untick and disable IPv6 in the network connection properties. You must follow the below proceedure to disable it fully;

1.Uncheck Internet Protocol Version 6 (TCP/IPv6) on your Network Card.
2. In Registry Editor, locate, backup and then click the following registry subkey: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServic esTcpip6Parameters
3. 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:
1. In the Edit menu, point to New, and then click DWORD (32-bit) Value.
2. Type DisabledComponents, and then press ENTER.
3. Double-click DisabledComponents.
4. Enter “ffffffff” (eight f’s), and then click OK:

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5. Reboot the SBS 2008 server.

RRAS (VPN) Note: If you plan to enable VPN on your SBS 2008 server, you MUST also Export and then Delete the following registry key: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServic esRemoteAccessRouterManagersIpv6

If you do not delete this key you will get an 20103 Event when trying to start RRAS with IPv6 disabled. You must reboot after removing this key.