Unable to connect to TFS server in Test Manager 2010

First time after installing TFS 2010 in the machine, when try to connect Test Manager 2010 to TFS 2008 project, throwing error that “Unable to connect to server , Check the server name is correct and that you have access to the server”.

Even after trying as the project administrator, same problem repeated. After going through some stuff it was know that TFS 2010 test manager cannot use the TFS 2008 features, because TFS 2008 doesn’t have the Test and lab features. So, TFS 2008 doesn’t have the test and lab features that are included in TFS 2010.

Solution: upgrade the server to TFS 2010 in order to connect from the client.