Instance creation overview and common errorsEdit online Use the overview, descriptions, and instructions to identify and resolve the possible errors that you might encounter with instance administration. Instance creation overviewAfter you install a server, you must have a user accounton the system, and then create a directory server instance. Use the Instance Administration Tool or the command-line interface to create a user and the directory server instance.Two directory instances use the same port numberOn the Windows™ 2003 Enterprise Server operating system, two directory instances can run on the same port numbers.Instance creation fails on Windows 2003On Windows™ 2003, instance creation might fail if the user password does not meet the operating system password requirements. Understand the cause of this problem and follow the steps to resolve it.Installation fails on Windows operating systemOn a Microsoft™ Windows™ operating system, the installation might fail and display a message such as “DB2® Installation was NOT successful.” Understand the cause of the problem and follow the steps to ensure a successful installation.Parent topic: Instance creation and configuration issues