TF42046: The build service used in the build process is not reachable.
The build service used in the build process is not reachable. This error occurs when either the server is offline, the required service is not running, Team Foundation Build is not installed on the build computer, or the network is not available.
This error may occur if the Team Build Service is blocked by the Windows Firewall.
To correct this error
Add the Team Build Service to the Windows Firewall exception list. For more information, see Windows Help.
Contact your Team Foundation Server administrator to confirm that Team Foundation Build is correctly installed and running, or contact your network administrator to confirm the server is available.