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TNS-12542 TNS: address already in usePlease make sure no process is using the same listener port using netstat command (kill those processes manually from the OS), or try rebooting the box and check again.
Listener Fails to Start With TNS: Address Already in Use (TNS-12542 TNS-12560 TNS-00512) [ID 416566.1]
Listener Fails to Start on Linux, Errors with TNS-12542, Linux Error: 98: Address already in use [ID 301014.1]
Listener Fails to Start and Reports Error TNS-12542 Address Already in Use [ID 1107064.1]
Please go through this article which gives you step by step guide to setting up EBS R12 from VM template. I was having similar problems like you and now its resolved.