DSGetSiteName failed: Status = 1919 0x77f ERROR_NO_SITENAME

To resolve this issue, associate a subnet with Default-First-Site-Name, and then manually set the site membership. To do so, follow these steps.

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Associate a Subnet with Default-First-Site-Name

1. Click Start, click Programs, point to Administrative Tools, and then click Active Directory Sites and Services.
2. Double-click the Sites node that corresponds to the Site where the Exchange Server resides, and then right-click Subnets.
3. Click New Subnet on the shortcut menu.
4. Type the IP address, and the subnet mask of the subnet, and then click Default-First-Site-Name on the Site Name list. Click OK to close the New Object-Subnet dialog box.

http://support.microsoft.com/kb/322834