Once and for all, you can change the machine name and IP address of Oracle at any time for Windows Server only. Other systems are not tested, but the principle is the same and should be feasible. It is very troublesome for Oracle to change the machine name and IP address. Here is a reference method to solve this problem once and for all. After configuring the machine and network card, we recommend that you set the machine name to a complex name to avoid duplication. Install a virtual network card (Microsoft Loopback Adapter), set the IP address to 100.100.100.100, and use the default IP address; modify the HOST file in the Windows \ System32 \ drivers \ etc directory, and add the following line: 100.100.100.100 The Name Of The machine just set. Start to install Oracle, try again to modify the machine name and IP address :). Applicable to Oracle 10/11 GB. If it is invalid, restart the system or Oracle service.