How To: Connect to an ArcSDE server from ArcCatalog
Steps to connect to an ArcSDE server from ArcCatalog.
Double-click the Add SDE Connection icon in the Catalog tree.
ArcCatalog 8.0.1/8.0.2 Catalog tree.
When the dialog box appears, type the server name, server instance name, and database (Sybase or Microsoft SQL Server only). Then type the user name and password specified by your ArcSDE administrator.
Instead of the server name, you can type the port the server listens on. Example: 5150.
Note: It is recommended you leave the Save Name/Password box checked as it will reduce the number of times you will be asked for the same information.
The connection is now available for use.
For more information on the steps above, see the online ArcGIS Desktop Help--Contents ArcCatalog > Building the Catalog > Adding spatial database connections.