tns-12560:TNS-00511

监听报这个错误

$ lsnrctl status

LSNRCTL for IBM/AIX RISC System/6000: Version 11.2.0.4.0 - Production on 26-MAR-2020 02:43:06

Copyright (c) 1991, 2013, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=LISTENER)))
TNS-12541: TNS:no listener
  TNS-12560: TNS:protocol adapter error
   TNS-00511: No listener
    IBM/AIX RISC System/6000 Error: 79: Connection refused

解决方式：

/etc/hosts 添加 localhost

原文：https://www.cnblogs.com/macliu1990/p/12571954.html