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The IP address of your local network adapter does not exist in the Local Address Table (LAT) for ISA Server

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When running the Small Business Server Configure Email and Internet Connection Wizard, you might see the following error:

The IP address of your local network adapter does not exist in the Local Address Table (LAT) for ISA Server. You will need to either add the IP address to the LAT or change the IP address of the network adapter. For more information, see Small Business Server Help.

This issue is caused by an incorrect value for LANNIC in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SmallBusinessServer\

LANNIC is set when SBS is first installed.  When SBS setup sees two network cards during the initial setup (first run of setup, prior to the Component Selection Screen where you choose Exchange, Fax, etc) it will ask "hey, which of these two NIC's is your internal NIC?".  When you select the NIC, two things happen:  First, the other NIC is disabled.  Second, LANNIC is written to the registry with the GUID of the internal network card.  If you then subsequently swap cables, you might run into problems running the CEICW. 

To resolve this issue, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SmallBusinessServer\LANNIC will have to be changed to reflect the actual GUID of the internal network adapter.

Here's what you do:

  • Open Regedit and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
  • Expand Interfaces, you should see several folders underneath - highlight each of them, looking for a value called IPAddress with the internal IP address of the server.  You will need to determine which GUID (folder on the left with the really long weird number) is the actual internal network card.  Again, the one with IPAddress of the internal network card is the one you want.
  • Right click on the GUID of the internal NIC on the left and choose "copy key name".
  • Open notepad and paste the key into notepad.
  • Now highlight the GUID in notepad (not the brackets, just the characters) and copy it.

For example, copy A7237F71-448E-4ED3-AE5E-2EF8976399B5 from HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{A7237F71-448E-4ED3-AE5E-2EF8976399B5}

  • Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SmallBusinessServer and double click on LANNIC
  • Copy the value you copied from notepad into LANNIC and click OK
  • Re-run the Small Business Server Configure Email and Internet Connection Wizard.

This article has the same steps but the error is different.  If you follow the instructions in the popup error when running the CEICW ("Alternatively, disable the DHCP service manually, and then configure your client computer IP address properties.") you get further in the wizard but are then presented with the "ISA LAT error".

 

Happy SBS'ing!

 

Petergal

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  • When running the Small Business Server Configure Email and Internet Connection Wizard, you might see

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