
The Team Foundation Application-Tier Server and the Team Foundation Data-Tier Server Cannot Communicate
Symptom: When running Team Foundation Server in a dual-server deployment, you cannot create a project or perform work. You are presented with error messages when you try most server operations.
Possible Causes:
A firewall or network router between the Team Foundation data-tier and the Team Foundation application tier is blocking network traffic between the two servers. Make sure that all necessary ports are configured to enable network traffic. For more information, see Team Foundation Server Security Architecture.
The network connection between the Team Foundation application-tier server and the Team Foundation data-tier server is too slow. There might be too much network traffic for your routers to handle efficiently, or one or more network cards on your Team Foundation servers might not be configured correctly. The configuration of network switches and your computers' network cards can affect the network speed. Confirm that these settings are correct. For more information about how to use an autodetect setting for the network cards, see the Microsoft Web site. For more information about network card settings, see the manufacturer's documentation.
The Team Foundation data-tier server and the Team Foundation application-tier server are in different Active Directory domains or forests without sufficient trusts. You must configure trusts appropriate to your Team Foundation Server deployment. For more information, see Trusts and Forests Considerations for Team Foundation Server.
Either the Team Foundation application-tier server, the Team Foundation data-tier server, or both servers are in a workgroup instead of a domain. These configurations are not supported. Only single-server deployments are supported in a workgroup environment.