I have a Win2k3 Std 64bit server running SQL 2005 Std. It's internal IP address is mapped to an external IP address using NAT. External users need to connect to the SQL instance without specifiying a port number (i.e. 'instance','port number') using the external IP address. At the moment users need to specify both the instance and port number to be able to connect to the database using the external IP. Is there any way of configuring SQL or the network to prevent having to use a port number to connect to the instance using the external IP address? Thanks in advance!