SQL Server 2008 Connecting from 2008R2 not from 2008

Hi,

In Server machine SSMS not  connecting server (SQL Server 2008) and error is

" cannot generate sspi context. (.net sqlclient data provider) management studio"

 but  from other machine(Client machine)  SSMS is connecting to the server.(Machine has SQL Server 2008R2).

Did any body has same problem ?,Please help to sort out the issue.

Thanks in advance