TF30024: Work Item Tracking could not retrieve data from the work items database server. This error occurs when either the ...

TF30024: Work Item Tracking could not retrieve data from the work items database server. This error occurs 
when either the server is off-line, the network is not available, or you do not have permission to access the 
server. Contact your network administrator to confirm that the server is available. If the problem persists, contact 
your Team Foundation Server administrator.