This Database Server Type is not supported

Dear Experts,

Kindly suggest your opinion regarding this issue we had freshly installed a SAP 2007B in our Server Edition is Microsoft Windows 2003 and Database is of MSSql_2005 R2 Standard Edition and we had upgraded the SAP 2007B to PL_18.

Now when we login to DTW on Change server for SQL Connection getting an error of "This Database Server Type is not Supported."

So any body had a solution or faced this kind of issue please share your knowledge to out come from this issue..

Thanks in Advance...

Regards

Krishnakumar