Today our IT managers are switching FS Domain, You may lose out CPN same error. After our IT switched our ORACLE server from ORTC to FS Domain, our oracle cannot accessed. The service(OracleOraDb11g_home1TNSListener) cannot start. The reason: After switched FS, computer name has been changed, so we must update listener.ora (X:\app\Administrator\product\11.1.0\db_1\NETWORK\ADMIN). LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521)) ) (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = mphch229.XXXXX.COM)(PORT = 1521)) ) ) After updated this file. The Service can start.