Unable to use project professional to establish connection to project server

I fail to use project professional 2003 to access to the project server 2003 using MSDE 2000 in local area network, following message was shown,

Connection failed:

SQLState: '01000' SQL Server Error 1326 [Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen (Connect())
Connection failed:
SQLState '08001'
SQL Server Error: 17
[Microsoft][ODBC SQL Server Driver][DBNETLIB]SQL Server does not exist or access denied.

I have seen these pages with similiar cases but can't help.

http://support.microsoft.com/kb/818047/

http://support.microsoft.com/kb/837653/en-us

Can anyone help me?? Thanks a lot!