Unable To Connect To Mssql Server Using Sql Express

Hi,

I installed Sqlexpress server 2005 and am able to connect to the server using the sqlexpress manager.

The connection parameters are:

server: 127.0.0.1 (This is an alias name pointing to TMD03SQLEXPRESS)
username:sa
password:test
mode: sql server and windows authentication mode
TCP/IP : enabled and listening on port number 1433.

But I am not able to connect to the server using PHP's mssql_connect function.

I tried various combinations like

mssql_connect("127.0.0.1","sa","test")
mssql_connect("local","sa","test")
mssql_connect("localhost","sa","test")
mssql_connect("TMD03SQLEXPRESS","sa","test")
mssql_connect("127.0.0.1,1433","sa","test")

but none of them works. I also tried OSQL and SQLCMD and they don't work either. They give me the following error message.

[SQL Native Client]Named Pipes Provider: Could not open a connection to SQL
Server [2].
[SQL Native Client]Login timeout expired
[SQL Native Client]An error has occurred while establishing a connection to
the server. When connecting to SQL Server 2005, this failure may be caused by
the fact that under the default settings SQL Server does not allow remote
connections.

Can anyone please let me know what am doing wrong here?

Regards,
Celia